Home » Public Forums » GMCnet » [GMCnet] More mystery wires...
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| Re: [GMCnet] More mystery wires... [message #187385 is a reply to message #187318] |
Mon, 15 October 2012 20:29   |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Sean,
In reference to picture 1 the connector is a red wire with black
connector. It appears that your coach was painted a light color and
the area under the hood got a lot of overspray. You probably can
clean most of that off with acetone and a soft rag. On my 75 Avion it
has a fusible link plugged into that point and runs off to something.
If it is not being used don't worry about it, it is not hurting
anything. My 78 stretch doesn't have anything connected to it
either. If you put a meter and check it to ground you may find it is
still hot (12 VDC) again no problem. It might be a good point to get
12 VDC in the future.
As for picture number 2, your are correct it is half of a fuse
holder. Have you check and see if it has 12VDC to ground. It is not
a factory fuse holder, and apparently the other half is not important!
The PO from what I can see in your picture has added some extra wiring
using those blue snap connectors. Those are truly junk and you should
try and remove them for a more permanent connection.
JR Wright
78 Buskirk Stretch
Michigan
> Hi all,
>
> I could use some help identifying these two wires:
>
> http://www.gmcmhphotos.com/photos/questions/p46143-more-mystery-wires.html
> - What is this connector for? I can't find its other half anywhere.
> Heavy gauge wire, maybe red (hard to tell the true color). Coming from
> a conduit with two other similar wires, one of them going to the horn
> relay.
>
> http://www.gmcmhphotos.com/photos/questions/p46144-more-mystery-wires.html
> - What is this connector for? It looks like an inline fuse holder, but
> I can't find its other half anywhere. It's a red wire, coming from a
> bundle with two others (orange and green).
>
> Thanks!
>
> --
> Sean
> 1973 260 Painted Desert
> Luna County, NM
> Gallery: http://goo.gl/Gfcpd
> GMCMH Search Engine: http://goo.gl/xd8PK
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] More mystery wires... [message #187456 is a reply to message #187451] |
Tue, 16 October 2012 12:16 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Not sure what the connector is for, but it looks like there is a splice in the
black wire that is right to the left of the thick red wire and the splice is
BARE ???
Ray
Ray & Lisa
78 Royale "Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: Mike Miller <m000035@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Tue, October 16, 2012 11:38:22 AM
Subject: Re: [GMCnet] More mystery wires...
Sean wrote on Mon, 15 October 2012 07:30
> I could use some help identifying these two wires:
>
> http://www.gmcmhphotos.com/photos/questions/p46143-more-mystery-wires.html
> - What is this connector for? I can't find its other half anywhere.
> Heavy gauge wire, maybe red (hard to tell the true color). Coming from
> a conduit with two other similar wires, one of them going to the horn
> relay.
High speed fan power. (All three of my coaches have this.. I believe it should
have a fusible link.)
I would be more concerned about what looks like a bare twisted wire "connection"
shown just to the left in the picture. It looks to be between the un-fused hot
connector block on the firewall and the horn relay. I think it is replacing
what should be a fusible link. VERY dangerous... looks like you PO was an
electrical idiot and did not know it.
Quote:
> ...
> http://www.gmcmhphotos.com/photos/questions/p46144-more-mystery-wires.html
> - What is this connector for? It looks like an inline fuse holder, but I can't
>find its other half anywhere. It's a red wire, coming from a bundle with two
>others (orange and green).
I do not know... what doesn't work? :twisted: (My '73 has this (disconnected)
also but neither the '77 or '78 has it.)
--
Mike Miller -- Hillsboro, OR -- on the Black list
(#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23'
Birchaven Side Bath
http://m000035.blogspot.com
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] More mystery wires... [message #187473 is a reply to message #187451] |
Tue, 16 October 2012 14:50 |
Sean
Messages: 189
Registered: March 2012
Karma: 0
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Senior Member |
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Hi Mike,
On Tue, Oct 16, 2012 at 10:38 AM, Mike Miller <m000035@gmail.com> wrote:
>
>
> Sean wrote on Mon, 15 October 2012 07:30
>> I could use some help identifying these two wires:
>>
>> http://www.gmcmhphotos.com/photos/questions/p46143-more-mystery-wires.html
>> - What is this connector for? I can't find its other half anywhere.
>> Heavy gauge wire, maybe red (hard to tell the true color). Coming from
>> a conduit with two other similar wires, one of them going to the horn
>> relay.
>
>
> High speed fan power. (All three of my coaches have this.. I believe it should have a fusible link.)
I can't seem to locate this on my wiring diagram. Can you tell me
where the other end is physically connected, or perhaps post a picture
of what you have?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
GMCMH Search Engine: http://goo.gl/xd8PK
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--
Sean
1973 260 Painted Desert
Luna County, NM
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| Re: [GMCnet] More mystery wires... [message #187803 is a reply to message #187797] |
Sat, 20 October 2012 18:30 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Sean,
On the chassis wiring diagram, look at the wire running from the alternator
output to the center terminal of the isolator (Red 10 g). Spliced into
that wire is a Red 12g which terminates with an arrow toward "X".
Now scan vertically down to near the bottom of the diagram to find the
other "X". You'll find that leads through a Green Fusible Link and a Red
12g with dbl White stripe to the heater relay.
I think that IS your high blower connector, but the color of the wire is
the essential clue.
With all the wiring problems you've got, I think you should contact my son
for a large wiring diagram:
http://bdub.net/GMC_Motorhome_Wiring_Diagrams.pdf
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Sat, Oct 20, 2012 at 6:36 PM, Sean F <wsfulmer@gmail.com> wrote:
> Here's a shot showing everything:
>
>
> http://www.gmcmhphotos.com/photos/questions/p46168-1-img-20121020-151932.html
>
> I did replace the fusible link, but I'm still left wondering about the
> two loose ends.
>
> If the large square connector is high-speed fan power (I think it
> might be, since my fan won't run on high), then where does it connect?
> I've looked all over and I can't see it anywhere.
>
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] More mystery wires... [message #187815 is a reply to message #187318] |
Sat, 20 October 2012 20:31 |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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On both our '73 and '75, the square connector attached to
the big red wire goes to a fusible link that connects to the
red-with-white-stripe wire.
There's another square connector attached to a black wire
that goes to the triple connector on the upper relay,
which is marked "htr" in your picture. But that looks
like it's hooked up in your coach.
I'm guessing a previous owner blew up the fusible
link so replaced it with a fuse. Don't know what
the red/white stripe wire goes to though since it
goes back into the harness, but the wiring diagram
might help (or not. sometimes I still can't figure
it out even with the diagram).
I think the blower wires come in on the other side
of the a/c box. There's a four-wire plug with yellow,
blue, light blue, and brown wires. The yellow wire is what
you disconnect to get the darned blower fan to not run all
the time in some model years.
hope this helps,
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] More mystery wires... [message #187853 is a reply to message #187815] |
Sun, 21 October 2012 10:42 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| KB wrote on Sat, 20 October 2012 18:31 |
...
I think the blower wires come in on the other side of the a/c box. There's a four-wire plug with yellow, blue, light blue, and brown wires. The yellow wire is what you disconnect to get the darned blower fan to not run all the time in some model years.
|
Actually that is the resistor package in the driver's side of the heater box. It is used to change the voltage applied to the fan for all of the fan speeds other than high. (High comes straight from the alternator output, before the isolator, meaning it will be a volt or two above the normal voltage found at the battery.)
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] More mystery wires... [message #187856 is a reply to message #187318] |
Sun, 21 October 2012 11:11 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Senior Member |
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Had the same find on mine yesterday and found no voltage on the connector you showed. I took the red/white wire from the blower relay ran it through a 30amp circuit breaker and got my power from the terminal stud marked vehicle battery positive. Now I have high speed. If someone knows a reason not to use a circuit breaker let me know.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: [GMCnet] More mystery wires... [message #187877 is a reply to message #187815] |
Sun, 21 October 2012 15:49 |
Sean
Messages: 189
Registered: March 2012
Karma: 0
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On Sat, Oct 20, 2012 at 7:31 PM, KB <kab7@sonic.net> wrote:
> On both our '73 and '75, the square connector attached to
> the big red wire goes to a fusible link that connects to the
> red-with-white-stripe wire.
>
> There's another square connector attached to a black wire
> that goes to the triple connector on the upper relay,
> which is marked "htr" in your picture. But that looks
> like it's hooked up in your coach.
>
> I'm guessing a previous owner blew up the fusible
> link so replaced it with a fuse. Don't know what
> the red/white stripe wire goes to though since it
> goes back into the harness, but the wiring diagram
> might help (or not. sometimes I still can't figure
> it out even with the diagram).
>
> I think the blower wires come in on the other side
> of the a/c box. There's a four-wire plug with yellow,
> blue, light blue, and brown wires. The yellow wire is what
> you disconnect to get the darned blower fan to not run all
> the time in some model years.
Ok, that makes a lot of sense, and I think my two wires are two pieces
of the same puzzle.
The fuse holder is on the red-with-double-white wire. I checked for
continuity between the fuse holder and the red-with-double-white wire
on the relay connector, and BEEP!
My wiring diagram doesn't show a fusible link going to
red-double-white, but it *does* show a 30-amp fuse.
So, I think the answer to the question "what do these two wires
connect to" is: each other, via the missing 30-amp fuse:
http://www.gmcmhphotos.com/photos/questions/p46169-mystery-solved.html
Does that make sense?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
GMCMH Search Engine: http://goo.gl/xd8PK
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--
Sean
1973 260 Painted Desert
Luna County, NM
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| Re: [GMCnet] More mystery wires... [message #187891 is a reply to message #187877] |
Sun, 21 October 2012 17:49 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Sean,
Sorry I mislead you about the fusible link: I neglected to read "1973" in
your signature block and automatically referred to my '76 wiring diagram,
by which time the fuse had been replaced with the fusible link.
Glad you figured it out in spite of my "help". :-)
Ken H.
On Sun, Oct 21, 2012 at 4:49 PM, Sean F <wsfulmer@gmail.com> wrote:
> ...
>
My wiring diagram doesn't show a fusible link going to
> red-double-white, but it *does* show a 30-amp fuse.
>
> So, I think the answer to the question "what do these two wires
> connect to" is: each other, via the missing 30-amp fuse:
>
> http://www.gmcmhphotos.com/photos/questions/p46169-mystery-solved.html
>
> Does that make sense?
>
> --
> Sean
> 1973 260 Painted Desert
> Luna County, NM
> Gallery: http://goo.gl/Gfcpd
> GMCMH Search Engine: http://goo.gl/xd8PK
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] More mystery wires... [message #187945 is a reply to message #187891] |
Mon, 22 October 2012 07:59 |
Sean
Messages: 189
Registered: March 2012
Karma: 0
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On Sun, Oct 21, 2012 at 4:49 PM, Ken Henderson <hend4800@bellsouth.net> wrote:
> Sean,
>
> Sorry I mislead you about the fusible link: I neglected to read "1973" in
> your signature block and automatically referred to my '76 wiring diagram,
> by which time the fuse had been replaced with the fusible link.
>
> Glad you figured it out in spite of my "help". :-)
No apologies necessary, you were actually very helpful with this, and
with my alternator problems. Thanks again!
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
GMCMH Search Engine: http://goo.gl/xd8PK
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Sean
1973 260 Painted Desert
Luna County, NM
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| Re: [GMCnet] More mystery wires... [message #187972 is a reply to message #187891] |
Mon, 22 October 2012 11:54 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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| Ken Henderson wrote on Sun, 21 October 2012 15:49 |
Sean,
Sorry I mislead you about the fusible link: I neglected to read "1973" in
your signature block and automatically referred to my '76 wiring diagram,
by which time the fuse had been replaced with the fusible link.
Glad you figured it out in spite of my "help". 
Ken H.
On Sun, Oct 21, 2012 at 4:49 PM, Sean F <wsfulmer@gmail.com> wrote:
> ...
>
My wiring diagram doesn't show a fusible link going to
> red-double-white, but it *does* show a 30-amp fuse.
>
> So, I think the answer to the question "what do these two wires
> connect to" is: each other, via the missing 30-amp fuse:
>
> http://www.gmcmhphotos.com/photos/questions/p46169-mystery-solved.html
>
> Does that make sense?
>
> --
> Sean
> 1973 260 Painted Desert
> Luna County, NM
> Gallery: http://goo.gl/Gfcpd
> GMCMH Search Engine: http://goo.gl/xd8PK
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Looks like you did good on that one Ken. I would assume it wasn't uncommon for that 30 amp fuse to blow under certain conditions so it was replaced with a fuseible link? I would think a fusible link or a 30 amp circuit breaker may be a better choice then the fuse and still give good protection .
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] More mystery wires... [message #187984 is a reply to message #187972] |
Mon, 22 October 2012 14:20 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Roy,
You're probably right. The starting surge current of that blower motor
will probably fatigue a fuse pretty quickly, especially when the bearings
begin to dry out a little -- or a twig gets sucked in through the fresh air
inlet. I'd guess they used the fusible link rather than redesign the
entire electrical harness to add another slot to the fuse box; and, they
probably didn't want a CB hanging from wires under the hood. All a big
WAG, of course. :-)
Ken H.
On Mon, Oct 22, 2012 at 12:54 PM, <roy@gmcnet.org> wrote:
> ...
> > My wiring diagram doesn't show a fusible link going to
> > > red-double-white, but it *does* show a 30-amp fuse.
> > >
> ...
> Looks like you did good on that one Ken. I would assume it wasn't uncommon
> for that 30 amp fuse to blow under certain conditions so it was replaced
> with a fusible link? I would think a fusible link or a 30 amp circuit
> breaker may be a better choice then the fuse and still give good protection
> .
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] More mystery wires... [message #187994 is a reply to message #187984] |
Mon, 22 October 2012 15:27 |
Sean
Messages: 189
Registered: March 2012
Karma: 0
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Senior Member |
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On Mon, Oct 22, 2012 at 1:20 PM, Ken Henderson <hend4800@bellsouth.net> wrote:
> Roy,
>
> You're probably right. The starting surge current of that blower motor
> will probably fatigue a fuse pretty quickly, especially when the bearings
> begin to dry out a little -- or a twig gets sucked in through the fresh air
> inlet. I'd guess they used the fusible link rather than redesign the
> entire electrical harness to add another slot to the fuse box; and, they
> probably didn't want a CB hanging from wires under the hood. All a big
> WAG, of course. :-)
>
> Ken H.
If were to replace the missing fuse with a fusible link, then what
gauge should I use?
It would connect a 12g wire to a 14g wire, so something smaller? 16g?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
GMCMH Search Engine: http://goo.gl/xd8PK
_______________________________________________
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--
Sean
1973 260 Painted Desert
Luna County, NM
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(My '73 has this (disconnected) also but neither the '77 or '78 has it.)