Home » Public Forums » GMCnet » Furnace mystery
| Furnace mystery [message #215746] |
Fri, 26 July 2013 10:09  |
lance
Messages: 190
Registered: December 2004
Location: Vancouver, WA
Karma: 0
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Guys, I recently had issues with my furnace that turned out to be low voltage on an old house battery. I replaced both house and engine batteries and all was well. The furnace ran fine once it got more than 10 volts. That was two days ago. This morning, no furnace. No fan, nothing. The thermostat clicks as it should when it is moved up but the furnace does not start. The fuses are fine. There is power out on every lug on the fuse panel but no voltage at the furnace on the red wire. The furnace is brand new, a month old. How can I loose voltage between the fuse panel and the furnace? I have not been fiddling with other circuits. The refrigerator seems to be on the same circuit and it is working.
I have a 1975 service manual and find it almost useless. The fuses are in a different order, the wire colors are all different and other differences that make me just want to throw it away. Anyone have a link to a 1974 12v schematic? Anyone have any other ideas?
1974 Palm Beach
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| Re: Furnace mystery [message #215773 is a reply to message #215746] |
Fri, 26 July 2013 11:58  |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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Senior Member |
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Billy Massey is our friend!!
http://www.bdub.net/manuals/index.html
I would try the early '76 schematic instead of the older 74.
Of course there are always the PO "adjustments".
I too have been working on circuits that loose connection in the wall between the fuse panel and the appliance.
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] Furnace mystery [message #215799 is a reply to message #215790] |
Fri, 26 July 2013 13:40 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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There may be a reset button located on the body of the heater. My heater had the exact same symptoms, and resetting cured it completely.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Furnace mystery [message #215849 is a reply to message #215790] |
Fri, 26 July 2013 23:48 |
lance
Messages: 190
Registered: December 2004
Location: Vancouver, WA
Karma: 0
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Senior Member |
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Emory,
please tell me how to upgrade my profile. I've searched and can't find a way.
My coach is a 74 that has been well cared for and upgraded without too much mucking about. the wiring appears to be un-mollested at the fuse panel but the labels next to the fuse and the associated color do not correspond to anything. My fuse, labeled "furnace" does not disable the furnace. I'm up to a challenge! That's why this is my third GMC. I like helping others on this forum but always encounter one issue or another that alludes me. This forum is why I bought my second GMC, a76 Palm Beach. You guys are the best. There is no issue that we can't throw enough money at to make a little better, but hey, that's how we roll.
But I digress. My issue is with the six feet between the fuse panel and the furnace. The new furnace ran fine for weeks, then nada. The coach hasn't moved. Although I do enjoy this full timer RV lifestyle because no matter where you go, when you get there, you're home. I like that, but I digress.
I was trained in electronics in the military. I can read a schematic and read a voltmeter but this plum evades me. I have had corrosion issues since I bought this cache a few months ago. I installed a new Suburban furnace and all my electrical connections are professional grade. 12v at the fuse panel, 0v at the furnace, both sides of the electrical connector. Six inaccessible feet separate the two. I can pull out he two drawers between the sink and the oven and see a wire loom but no connectors.
Does anyone have a link to a 74 12v schematic? Do you other 74 owners encounter issues like this? It seems that the second year of manufacure was subject to change.
1974 Palm Beach
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| Re: [GMCnet] Furnace mystery [message #215872 is a reply to message #215849] |
Sat, 27 July 2013 09:04 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| lance wrote on Sat, 27 July 2013 00:48 |
Emory,
please tell me how to upgrade my profile. I've searched and can't find a way.
My coach is a 74 that has been well cared for and upgraded without too much mucking about. the wiring appears to be un-mollested at the fuse panel but the labels next to the fuse and the associated color do not correspond to anything. My fuse, labeled "furnace" does not disable the furnace. I'm up to a challenge! That's why this is my third GMC. I like helping others on this forum but always encounter one issue or another that alludes me. This forum is why I bought my second GMC, a76 Palm Beach. You guys are the best. There is no issue that we can't throw enough money at to make a little better, but hey, that's how we roll.
But I digress. My issue is with the six feet between the fuse panel and the furnace. The new furnace ran fine for weeks, then nada. The coach hasn't moved. Although I do enjoy this full timer RV lifestyle because no matter where you go, when you get there, you're home. I like that, but I digress.
I was trained in electronics in the military. I can read a schematic and read a voltmeter but this plum evades me. I have had corrosion issues since I bought this cache a few months ago. I installed a new Suburban furnace and all my electrical connections are professional grade. 12v at the fuse panel, 0v at the furnace, both sides of the electrical connector. Six inaccessible feet separate the two. I can pull out he two drawers between the sink and the oven and see a wire loom but no connectors.
Does anyone have a link to a 74 12v schematic? Do you other 74 owners encounter issues like this? It seems that the second year of manufacure was subject to change.
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Lance,
goto: http://gmc.mybirdfeeder.net/GMCforum/
log in
goto: Control panel
goto: Account Settings
it is down the page - just remember to click "Update" before you leave.
I had a problem not too dissimilar to yours this last weekend.
The aisle light didn't work. (these are essential when you have a black dog.) The fuse was labeled correctly and it was solid when I pulled it. I even put in a new fuse and still Nada....
They lights flashed when I pulled the new fuse out??? So, I put it back in - flash again. So, I slid the fuse in the clips until things cleaned up enough to work.
I have a largely unmolested late '73 and I have found the circuit labeling to be correct. But, alas, years have taken their toll. Before you finish pulling hair, check at the out end clip of the fuse for power.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Furnace mystery [message #215894 is a reply to message #215872] |
Sat, 27 July 2013 10:53 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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When I was at o'riellys a few weeks ago to get some blade type fuses for a dirt bike to street licensed project I stumbled across blade fuses with a built in led. When the fuse fails, the led glows which makes visual fuse inspection a breeze. I will likely change out my fuses in the fuse block that I bought from West Marine to use these fuses. They cost a little more but they are ideal for a fuse panel mounted in the dark(like most I get to work on)
As a side note, if your p.o installed a later model battery smart charger and linked it to the stock house glass fuse distribution panel check their connection to that fuse panel. Mine had connected it to the wrong side of the main fuse which basically eliminated the fuse panel. Figured that one out while pulling house wires through the alum ribbing and getting sparks with the main fuse removed...........
Todd Sullivan
Sully
77 royale
Seattle
On Jul 27, 2013, at 7:04 AM, Matt Colie <matt7323tze@gmail.com> wrote:
>
>
> lance wrote on Sat, 27 July 2013 00:48
>> Emory,
>> please tell me how to upgrade my profile. I've searched and can't find a way.
>>
>> My coach is a 74 that has been well cared for and upgraded without too much mucking about. the wiring appears to be un-mollested at the fuse panel but the labels next to the fuse and the associated color do not correspond to anything. My fuse, labeled "furnace" does not disable the furnace. I'm up to a challenge! That's why this is my third GMC. I like helping others on this forum but always encounter one issue or another that alludes me. This forum is why I bought my second GMC, a76 Palm Beach. You guys are the best. There is no issue that we can't throw enough money at to make a little better, but hey, that's how we roll.
>>
>> But I digress. My issue is with the six feet between the fuse panel and the furnace. The new furnace ran fine for weeks, then nada. The coach hasn't moved. Although I do enjoy this full timer RV lifestyle because no matter where you go, when you get there, you're home. I like that, but I digress.
>>
>> I was trained in electronics in the military. I can read a schematic and read a voltmeter but this plum evades me. I have had corrosion issues since I bought this cache a few months ago. I installed a new Suburban furnace and all my electrical connections are professional grade. 12v at the fuse panel, 0v at the furnace, both sides of the electrical connector. Six inaccessible feet separate the two. I can pull out he two drawers between the sink and the oven and see a wire loom but no connectors.
>>
>> Does anyone have a link to a 74 12v schematic? Do you other 74 owners encounter issues like this? It seems that the second year of manufacure was subject to change.
>
> Lance,
> goto: http://gmc.mybirdfeeder.net/GMCforum/
> log in
> goto: Control panel
> goto: Account Settings
> it is down the page - just remember to click "Update" before you leave.
>
> I had a problem not too dissimilar to yours this last weekend.
> The aisle light didn't work. (these are essential when you have a black dog.) The fuse was labeled correctly and it was solid when I pulled it. I even put in a new fuse and still Nada....
> They lights flashed when I pulled the new fuse out??? So, I put it back in - flash again. So, I slid the fuse in the clips until things cleaned up enough to work.
>
> I have a largely unmolested late '73 and I have found the circuit labeling to be correct. But, alas, years have taken their toll. Before you finish pulling hair, check at the out end clip of the fuse for power.
>
> Matt
>
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air)
> Now with 4 working Rear Brakes
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Furnace mystery [message #226128 is a reply to message #226125] |
Fri, 18 October 2013 15:20 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Todd, In order to answer correctly the first time, we need to know make
and model of your furnace. It could be a Solaire, Coleman, and several
suburban models. All are quite different.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Oct 18, 2013 1:14 PM, "Todd Perkins" <taperk@gmail.com> wrote:
>
>
> Where is the reset button? I see a sticker pointing down (at the top left
> of the unit) and I see the fuse holder (at the left bottom) but no reset
> button. Does any one have a picture, diagram, button color anything to
> help me find it?
>
> thank you all for the great help!!!
>
> Todd
> --
> Todd
>
> New owner of a 1976 Eleganza II 26’
> other toys:
> 94 Vette
> 84 Goldwing
> 72 CB750 Chopper
> 96 Caprice Classic
> and gone but not forgotten 34 Ford roadster
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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