| [GMCnet] No 12 volt to A/C motor relay [message #214177] |
Fri, 12 July 2013 20:10  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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I can find the A/C fuse in the block. It's OK. I don't have 12 volt from the red with white strip wire at the fan relay. I'm leaving Sunday AM. Is there another fuse that's out of the coach dash fuse block? THANKS, Bob Dunahugh E-mail or call 319-521-4891.
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| Re: [GMCnet] No 12 volt to A/C motor relay [message #214183 is a reply to message #214177] |
Fri, 12 July 2013 20:47  |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Bob, FWIW, that was a problem when I bought my coach too. Turned out just to be a flaky connection behind the fuse panel in the dash. Worst case, you could always just wire in another 12V source for that relay, from the chassis battery connection, through an appropriate fuse, to the relay. That'll save you having to pull your fuse panel out.
Good luck (not that I can imagine a problem of this size slowing YOU down!!!).
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] FW: No 12 volt to A/C motor relay [message #214216 is a reply to message #214204] |
Sat, 13 July 2013 12:16 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Bob,
As others will also type, it would be a great benefit if you were to add a Signature line at the end of your emails. I use one of several depending on where I am sending the email to. It helps us help you when we know what year model and what state (at a minimum) to better help you with your problems and this go for newbies and some established but seldom poster too! This really save time in getting an answer to your questions the first you type for help.
Some examples are and I will use mine:
JR Wright
GMC Great Laker MHC
GMC Eastern States
GMCMHI
78 Buskirk 30' Stretch
1975 Avion (Under Reconstruction)
Michigan
Or less information:
JR Wright
30' Buskirk Stretch
75 Avion
Michigan
I see that you use hotmail so go into your account settings in the upper right corner. Go to this area to help add a signature.
http://windows.microsoft.com/en-us/windows-live/mail-create-signature
From your email I see that you're having heat issues with the relay, wiring and fuses.
I went thru a number of blower relays the first few year we had our 77 Eleganza. The blower motor was drawing high amps while it ran. Got wires hot and blew fuses and the relay eventually failed. Although the blower still ran the motor being 30+ years old, the oil impregnated bearing had dried out and were dragging. They cannot be reoiled. I change out the blower motor and all the problems disappear. The air flow increased out the ducts. You can get a blower motor for about $20 from Autozone. Less than 45 minutes to change it out.
http://goo.gl/CYTRK
or
< http://www.autozone.com/autozone/parts/Continental-A-C-Heater-Blower-Motor/1976-Oldsmobile-Toronado/_/N-io1fxZ91sgz?itemIdentifier=141515_0_6648_2398% 2C5281>
You will need to remove and reuse the squire cage section of the old unit.
Good Luck!
JR Wright
30' Buskirk Stretch
75 Avion
Michigan
On Jul 13, 2013, at 10:34 AM, Bob Dunahugh <yenko108@hotmail.com> wrote:
>
>
>
> John. It's a 78 Royale. The delay relay failed last year. Pulled it then. Mark. Thanks for your comment also. I'm thinking the same way, that coming up with a different 12 volt source. I went an picked up an weather tight blade in line fuse holder last night. As this seemed to be going in that direction. But wasn't sure. The blower is a big load on an old factory fuse block. Thanks, Bob Dunahugh
>
>
>
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> I can find the A/C fuse in the block. It's OK. I don't have 12 volt from the red with white strip wire at the fan relay. I'm leaving Sunday AM. Is there another fuse that's out of the coach dash fuse block? THANKS, Bob Dunahugh E-mail or call 319-521-4891.
>
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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] No 12 volt to A/C motor relay (Solved ) [message #214233 is a reply to message #214221] |
Sat, 13 July 2013 15:01 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Bob,
The part number for the resistor pack is DR758. It is available at Autozone under that part number.
< http://www.autozone.com/autozone/parts/Duralast-A-C-Heater-Blower-Motor-Resistor/1976-Oldsmobile-Toronado/_/N-io1fxZ91tag?itemIdentifier=604005_0_0_52 81>
or
http://goo.gl/nIGXG
Advance Auto
< http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_blower-motor-resistor-wells-vehicle-electronics_10197732-p?isAllVehicle=false&s howTitle=&vehicleIdFromReq=3330&vehicleIdSearch=3330>
or
http://goo.gl/GyRU9
Carquest
<http://www.carquest.com/webapp/wcs/stores/servlet/product_CARQUEST+Heater+%26+A%2FC+Switches+By+Wells__10151_-1_10651_458268_23085?acesApp=1>
or
http://goo.gl/hmHrV
All in the $25 range.
I have been finding them in the men's mall but they are hard to find in good condition.
On Jul 13, 2013, at 2:23 PM, Bob Dunahugh <yenko108@hotmail.com> wrote:
> On the 2 -78 Royales ( 54 VIN's apart ) I put a fused 12 volt power supply to the fan blower relays on both. That might be a good way to remove a heavy load from an old wiring system. So now my relay has live fused power to it at all time. An the dash switch still controls the relay. ( All delay relay's are removed. ) As I had problems with both in regards to the blowers. The one with no high was a bad spade connector. On the other coach. I have high, and no low or med. It's the resister group. I don't have my parts book with me. Anyone have the resister # close? I just charged one with R-12. All is well. I'm going to change to Dura Cool when I can get some.
>
You still have not resolved the problem, you have just moved it to another area with the use of relays. It is probably why the blower motor resistor failed also. Until you resolve the high current draw of the fan motor you will still have issues and you will most probably burn up the new blower motor resistor pack. You not the first to have had this problem, been there and done that. You need to get to the root cause.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
>
> John. It's a 78 Royale. The delay relay failed last year. Pulled it then. Mark. Thanks for your comment also. I'm thinking the same way, that coming up with a different 12 volt source. I went an picked up an weather tight blade in line fuse holder last night. As this seemed to be going in that direction. But wasn't sure. The blower is a big load on an old factory fuse block. Thanks, Bob Dunahugh
>
> I can find the A/C fuse in the block. It's OK. I don't have 12 volt from the red with white strip wire at the fan relay. I'm leaving Sunday AM. Is there another fuse that's out of the coach dash fuse block? THANKS, Bob Dunahugh E-mail or call 319-521-4891.
>
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GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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