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| Re: HEI 12v source selection [message #198901 is a reply to message #198831] |
Mon, 18 February 2013 15:24   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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The pink line is a resistance (nichrome) wire. Simply follow the pink line up to the connector on the front fire wall. Then attach your new (replacement) wire there for the HEI and you will be fine.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Thu, 21 February 2013 04:48] Report message to a moderator |
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| Re: HEI 12v source selection [message #198982 is a reply to message #198901] |
Mon, 18 February 2013 22:19 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Ken Burton wrote on Mon, 18 February 2013 15:24 |
The pink line is a resistance (nichrome) wire. Simply follow the pink line up to the connector on the front fire wall. Then attach you new (replacement) wire there for the HEI and you will be fine.
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On my '74 the resistance wire was #20AWG black with printing that says "resistance wire do not cut". The drawing says it should have a pink stripe but that appears to be long gone. It is spliced within the harness to an 18AWG black wire that goes to the firewall terminal block. The resistance wire is approximately 4-1/2' long.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: HEI 12v source selection [message #198987 is a reply to message #198982] |
Mon, 18 February 2013 22:28 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| midlf wrote on Mon, 18 February 2013 22:19 |
| Ken Burton wrote on Mon, 18 February 2013 15:24 |
The pink line is a resistance (nichrome) wire. Simply follow the pink line up to the connector on the front fire wall. Then attach you new (replacement) wire there for the HEI and you will be fine.
.
|
On my '74 the resistance wire was #20AWG black with printing that says "resistance wire do not cut". The drawing says it should have a pink stripe but that appears to be long gone. It is spliced within the harness to an 18AWG black wire that goes to the firewall terminal block. The resistance wire is approximately 4-1/2' long.
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So all you have to do is replace 4.5 inches of wire? I have only seen that wire on the diagrams and not in real life. So I did not realize how long it was.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: HEI 12v source selection [message #199042 is a reply to message #198987] |
Tue, 19 February 2013 10:58 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Ken Burton wrote on Mon, 18 February 2013 22:28 |
| midlf wrote on Mon, 18 February 2013 22:19 |
On my '74 the resistance wire was #20AWG black with printing that says "resistance wire do not cut". The drawing says it should have a pink stripe but that appears to be long gone. It is spliced within the harness to an 18AWG black wire that goes to the firewall terminal block. The resistance wire is approximately 4-1/2' long.
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So all you have to do is replace 4.5 inches of wire? I have only seen that wire on the diagrams and not in real life. So I did not realize how long it was.
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It is four and half feet.
It is relatively easy to pull the wire out of the loom and replace it. The splice from the regular 18 gauge to the resistance wire is buried in the harness. It only has a few tapes securing the bundle inside the loom that need to be cut.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: HEI 12v source selection [message #199044 is a reply to message #199042] |
Tue, 19 February 2013 11:51 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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| midlf wrote on Tue, 19 February 2013 08:58 |
| Ken Burton wrote on Mon, 18 February 2013 22:28 |
| midlf wrote on Mon, 18 February 2013 22:19 |
On my '74 the resistance wire was #20AWG black with printing that says "resistance wire do not cut". The drawing says it should have a pink stripe but that appears to be long gone. It is spliced within the harness to an 18AWG black wire that goes to the firewall terminal block. The resistance wire is approximately 4-1/2' long.
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So all you have to do is replace 4.5 inches of wire? I have only seen that wire on the diagrams and not in real life. So I did not realize how long it was.
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It is four and half feet.
It is relatively easy to pull the wire out of the loom and replace it. The splice from the regular 18 gauge to the resistance wire is buried in the harness. It only has a few tapes securing the bundle inside the loom that need to be cut.
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In my opinion it is a good idea to relocate the feed wire to the HEI so it doesn't feed thru the plug in the fire wall. The reason I say this is it was a reason my engine had a misfire problem that was hard to diagnosis some time ago. I just found where it terminates at the ignition switch and ran a larger one piece wire directly to the distributor.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: HEI 12v source selection [message #199179 is a reply to message #199042] |
Thu, 21 February 2013 04:52 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| midlf wrote on Tue, 19 February 2013 10:58 |
| Ken Burton wrote on Mon, 18 February 2013 22:28 |
| midlf wrote on Mon, 18 February 2013 22:19 |
On my '74 the resistance wire was #20AWG black with printing that says "resistance wire do not cut". The drawing says it should have a pink stripe but that appears to be long gone. It is spliced within the harness to an 18AWG black wire that goes to the firewall terminal block. The resistance wire is approximately 4-1/2' long.
|
So all you have to do is replace 4.5 inches of wire? I have only seen that wire on the diagrams and not in real life. So I did not realize how long it was.
|
It is four and half feet.
It is relatively easy to pull the wire out of the loom and replace it. The splice from the regular 18 gauge to the resistance wire is buried in the harness. It only has a few tapes securing the bundle inside the loom that need to be cut.
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Sorry, that was a mis-read on my part. I thought that the resistance wire went all the way back to the big firewall plug that has a thousand contacts on it. But having never replaced one myself I was willing to accept 4.5 inches as the correct amount. I stand corrected.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] HEI 12v source selection [message #199224 is a reply to message #199179] |
Thu, 21 February 2013 12:21 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Just as a matter of reference, the symbols for inches and feet follow:
FOOT = '
INCH = '' (or ")
It does appear that one or more folks either mistyped or misread what
followed 4.5 in all of this.
I'm still confused and it would probably behoove me to find this
resistance wire and replace it with an appropriate fixed resistor and
adequately sized wire OUTSIDE of the harness!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> To: gmclist@temp.gmcnet.org
> From: n9cv@comcast.net
> Date: Thu, 21 Feb 2013 04:52:24 -0600
> Subject: Re: [GMCnet] HEI 12v source selection
>
>
>
> midlf wrote on Tue, 19 February 2013 10:58
> > Ken Burton wrote on Mon, 18 February 2013 22:28
> > > midlf wrote on Mon, 18 February 2013 22:19
> > > > On my '74 the resistance wire was #20AWG black with printing that says "resistance wire do not cut". The drawing says it should have a pink stripe but that appears to be long gone. It is spliced within the harness to an 18AWG black wire that goes to the firewall terminal block. The resistance wire is approximately 4-1/2' long.
> > >
> > >
> > >
> > > So all you have to do is replace 4.5 inches of wire? I have only seen that wire on the diagrams and not in real life. So I did not realize how long it was.
> >
> >
> > It is four and half feet.
> >
> > It is relatively easy to pull the wire out of the loom and replace it. The splice from the regular 18 gauge to the resistance wire is buried in the harness. It only has a few tapes securing the bundle inside the loom that need to be cut.
>
> Sorry, that was a mis-read on my part. I thought that the resistance wire went all the way back to the big firewall plug that has a thousand contacts on it. But having never replaced one myself I was willing to accept 4.5 inches as the correct amount. I stand corrected.
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
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| Re: [GMCnet] HEI 12v source selection [message #199226 is a reply to message #199224] |
Thu, 21 February 2013 12:28 |
kelvin
Messages: 608
Registered: February 2004
Location: Eugene, OR
Karma: 0
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Senior Member |
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What I did on my '73 230.
http://www.gmcmhphotos.com/photos/g3247-10-ohm-alternator-wire.html
Not sure if the colors will be the same but this was vetted thru
half-a-dozen GMC gurus when I did it.
Kelvin
On 2/21/2013 10:21 AM, D C _Mac_ Macdonald wrote:
> Just as a matter of reference, the symbols for inches and feet follow:
>
> FOOT = '
>
> INCH = '' (or ")
>
> It does appear that one or more folks either mistyped or misread what
> followed 4.5 in all of this.
>
> I'm still confused and it would probably behoove me to find this
> resistance wire and replace it with an appropriate fixed resistor and
> adequately sized wire OUTSIDE of the harness!
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ______________
> *[ ]~~~[][ ][|\
> *--OO--[]---O-*
>
>
>
>
>
>> To: gmclist@temp.gmcnet.org
>> From: n9cv@comcast.net
>> Date: Thu, 21 Feb 2013 04:52:24 -0600
>> Subject: Re: [GMCnet] HEI 12v source selection
>>
>>
>>
>> midlf wrote on Tue, 19 February 2013 10:58
>>> Ken Burton wrote on Mon, 18 February 2013 22:28
>>>> midlf wrote on Mon, 18 February 2013 22:19
>>>>> On my '74 the resistance wire was #20AWG black with printing that says "resistance wire do not cut". The drawing says it should have a pink stripe but that appears to be long gone. It is spliced within the harness to an 18AWG black wire that goes to the firewall terminal block. The resistance wire is approximately 4-1/2' long.
>>>>
>>>>
>>>> So all you have to do is replace 4.5 inches of wire? I have only seen that wire on the diagrams and not in real life. So I did not realize how long it was.
>>>
>>> It is four and half feet.
>>>
>>> It is relatively easy to pull the wire out of the loom and replace it. The splice from the regular 18 gauge to the resistance wire is buried in the harness. It only has a few tapes securing the bundle inside the loom that need to be cut.
>> Sorry, that was a mis-read on my part. I thought that the resistance wire went all the way back to the big firewall plug that has a thousand contacts on it. But having never replaced one myself I was willing to accept 4.5 inches as the correct amount. I stand corrected.
>>
>>
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>
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| Re: [GMCnet] HEI 12v source selection [message #199269 is a reply to message #199224] |
Thu, 21 February 2013 19:16 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| k2gkk wrote on Thu, 21 February 2013 12:21 |
Just as a matter of reference, the symbols for inches and feet follow:
FOOT = '
INCH = '' (or ")
It does appear that one or more folks either mistyped or misread what followed 4.5 in all of this.
I'm still confused and it would probably behoove me to find this
resistance wire and replace it with an appropriate fixed resistor and adequately sized wire OUTSIDE of the harness!
|
What we were talking about is the dropping resistance wire going to the POINTS ignition. You do not have one because you have an HEI ignition. On the HEI a full +12 volts is fed to it all the time without the dropping resistor.
Also I know the difference between " and '. I just mis-read the annotation in the original posting.
I believe the correct size wire for the HEI is 18 Gauge. Also the circuit is not fused and only draws about 1.5 amps. I have a 3 amp fuse in line with mine and it has never blown. I only added the fuse because I was doing a lot of rewiring at the time due to my engine fire. I also have my electric choke wired to this same circuit on a separate 3 amp fuse. I have a my electric fuel pump also on this same circuit on it's own 3 amp fuse.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Thu, 21 February 2013 19:19] Report message to a moderator |
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| Re: [GMCnet] HEI 12v source selection [message #199328 is a reply to message #199327] |
Fri, 22 February 2013 14:57 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Doug, Hei takes full battery voltage. Points type ignitions. require
resistor wires or similar to extend point life.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Feb 22, 2013 12:50 PM, "Douglas Norton" <nortocd@yahoo.com> wrote:
> I am putting an HEI distributor in my 73 sequoia as part of an EFI
> installation. Am I supposed to run the resistor wire or a wire in series
> with a resistor to my distributor? I was about to run straight 12 volts to
> the HEI and then I read the last several entries in this thread. Putting
> 12 volts to a circuit intended for a lower voltage could be asking for
> fried electrical essentials.
>
>
>
>
> ________________________________
> From: Ken Burton <n9cv@comcast.net>
> To: gmclist@temp.gmcnet.org
> Sent: Thursday, February 21, 2013 5:16 PM
> Subject: Re: [GMCnet] HEI 12v source selection
>
>
>
> k2gkk wrote on Thu, 21 February 2013 12:21
> > Just as a matter of reference, the symbols for inches and feet follow:
> >
> > FOOT = '
> >
> > INCH = '' (or ")
> >
> > It does appear that one or more folks either mistyped or misread what
> > followed 4.5 in all of this.
> >
> > I'm still confused and it would probably behoove me to find this
> > resistance wire and replace it with an appropriate fixed resistor and
> adequately sized wire OUTSIDE of the harness!
>
> What we were talking about is the dropping resistance wire going to the
> POINTS ignition. You do not have one because you have an HEI ignition.
> On the HEI a full +12 volts is fed to it all the time without the dropping
> resistor.
>
> Also I know the difference between " and '. I just mis-read the
> annotation in the original posting.
>
> I believe he correct size wire for the HEI is 18 Gauge. Also the circuit
> in not fused and only draws about 1.5 amps. I have a 3 amp fuse in line
> with mine and it has never blown. I only added the fuse because I was
> doing a lot of rewiring at the time due to my engine fire. I also have my
> electric choke wired to this same circuit on a separate 3 amp fuse. I have
> a my electric fuel pump also on this same circuit on it's own 3 amp fuse.
>
> Ken B.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: HEI 12v source selection [message #199573 is a reply to message #198799] |
Sat, 23 February 2013 23:55 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Hi Doug:
I know a number of people have been telling you pretty well what to do for your HEI Ignition. Some of it is a little bit misleading and I wanted to create a clearification for you and others reading the forum. Factory HEI Ignition power is different from Factory Points ignition power. I personally would emulate factory wireing as closley as possible. 12 volt power coming directly from the ignition switch through a 12ga wire will supply the ignition module with an appropriate resource to do it's job. Having the power source coming from a shared circuit, can lead to problems. I've had to upgrade and install a number HEI systems and I've documented the change to my 1974 Canyonlands. It will help. First read the simplifed wire diagram for a Points Ignition system.
http://www.gmcmhphotos.com/photos/discussion-photos/p47548-ignition-wire.html
This will help to understand what needs to be changed for the HEI.
The Documented change is located in this photo folder.
http://www.gmcmhphotos.com/photos/g6299-hei-wireing-upgrade.html
Best Regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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