| Blower Motor Runs on Accessory Mode [message #278326] |
Sun, 24 May 2015 21:48  |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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As then title indicates, my blower motor operates when the key is in the accessory position. Does not seem right to me. Is this normal? I have never had a GM car that did that. My coach is unmolested and very original. I can't imagine how the blower motor would be getting accessory power vs ignition switched.
Any thoughts?
I may have to run an ignition switched wire. I would like to be able to listen to the radio without the blower on.
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: [GMCnet] Blower Motor Runs on Accessory Mode [message #278346 is a reply to message #278331] |
Mon, 25 May 2015 03:18  |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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That seems odd, I mean, I've never seen a car where I cannot have the radio
on and everything else off, that's basically what the ACC position is for.
Then you have run, start, and off (where the key can come out).
Are the motorhomes that different?
On Sun, May 24, 2015 at 8:20 PM, Emery Stora wrote:
> I believe it is operating as it should.
>
> As a suggestion why not run your radio from the house batteries. Many of
> us converted this years back. That way you don't have a problem with what
> is running of the ignition switch and you won't run down the start battery.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
>> On May 24, 2015, at 8:48 PM, Steve Adams wrote:
>>
>> As then title indicates, my blower motor operates when the key is in the
> accessory position. Does not seem right to me. Is this normal? I have never
>> had a GM car that did that. My coach is unmolested and very original. I
> can't imagine how the blower motor would be getting accessory power vs
>> ignition switched.
>>
>> Any thoughts?
>>
>> I may have to run an ignition switched wire. I would like to be able to
> listen to the radio without the blower on.
>> --
>> 1978 GMC Royal
>> Eastern Pennslyvania
>> 1968 Chevrolet C20 396 Camper Special
>> 1969 Chevrolet C20 Camper Special
>> 1985 Buick Electra Park Avenue
>> 1992 Camaro 25th Anniversary Heretage Edition Black
>>
>> _______________________________________________
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--
Plato seems wrong to me today.
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1973 26' GM outfitted
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| Re: Blower Motor Runs on Accessory Mode [message #278352 is a reply to message #278326] |
Mon, 25 May 2015 09:07 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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I just looked at the 77/78 wiring diagram. It shows that the radio is not even in the ignition switch circuit, but wired directly to the battery buss. It should turn on with the ignition off.
My 74 works that way too. Even the signal lights will operate without the ignition on.
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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| Re: Blower Motor Runs on Accessory Mode [message #278355 is a reply to message #278326] |
Mon, 25 May 2015 09:29 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Also looking at the wiring diagram the fan control is correct in that it is using the accessory side of the switch.
Here is where you can get a copy of the diagrams It will be helpful when you are diagnosing electrical problems with your unit.
http://bdub.net/wirediagrams/
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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| Re: Blower Motor Runs on Accessory Mode [message #278387 is a reply to message #278326] |
Mon, 25 May 2015 15:51 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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On my 77 dash radio works with no key. That's fine as I have a combiner. Fan runs on accy. as well as ign run. Idea is to bring in outsde air to keep monoxide levels diluted. Also positive pressure minimizes holding tank odors on the cabin. Wes did a write up on this topic. I find more accurate than his tire suggestions!
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Blower Motor Runs on Accessory Mode [message #278388 is a reply to message #278326] |
Mon, 25 May 2015 16:02 |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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Senior Member |
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Everyone,
Thanks for the input. It seems that the wiring diagrams confirm that the fan motor is running off the accessory side of the ignition switch, thanks John. That seemed crazy to me until I heard that the radio was wired directly to the battery bus. That would make sense for a motor home so you could listen to the radio without the ignition switch. I like Emery's suggestion to wire the radio to to the house battery. I'll have to think about the best place to grab the house power near the dash, possibly off the boost switch. I believe my wiring to be unmolested at this point. The only custom wiring I have seen so far was a simple power wire for a CB radio.
I just saw John455's post. I understand bringing in fresh air and positive cabin pressure but it still seems strange to me to have anything but radio or other accessories on accessory. Thanks for the input J455.
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: Blower Motor Runs on Accessory Mode [message #278391 is a reply to message #278326] |
Mon, 25 May 2015 16:41 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Pretty much like every other GM car from the era. Was intended to help keep the ac core dry from what I have been told.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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