Need wiring help with blower switch connections - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 12-23-2005, 12:24 PM

My blower stopped working, again. Last winter I replaced the blower motor and relay. Now it stopped again, not sure if it's a power problem or switch. I'm going to check now but need info on what wires and where they connect to the blower switch.

It's an a/c 72 C20 truck that a po put a wrong switch in. I have an old correct one which I'm gonna try putting in. Wires were cut and new ends put on so I don't know which color goes on whick terminal (plug gone).

If some one can tell me what color wires go where, or has a pic of this I would really appreciate it. It's getting cold!

Thanks and happy holidays to all!

**john** · 12-23-2005, 02:40 PM

heres a diagram John

DangerBoy · 12-23-2005, 03:00 PM

I was having the same problem with mine until I checked the heat and AC fuses and the AC one was blown. I swapped it and it blows like mad now. Not sure why theres an AC fuse on a non AC truck though...

**ScottH** · 12-23-2005, 03:43 PM

Thanks guys. I have it working but only on one setting. From the look of the diagram (thanks John) there is a resistor. Can anyone tell me where it is located (or supposed to be)? Could also be the switch itself I guess.

Thanks again

12-23-2005, 12:24 PM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Need wiring help with blower switch connections My blower stopped working, again. Last winter I replaced the blower motor and relay. Now it stopped again, not sure if it's a power problem or switch. I'm going to check now but need info on what wires and where they connect to the blower switch. It's an a/c 72 C20 truck that a po put a wrong switch in. I have an old correct one which I'm gonna try putting in. Wires were cut and new ends put on so I don't know which color goes on whick terminal (plug gone). If some one can tell me what color wires go where, or has a pic of this I would really appreciate it. It's getting cold! Thanks and happy holidays to all!

12-23-2005, 02:40 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Need wiring help with blower switch connections heres a diagram John Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 12-23-2005 at 02:42 PM.

12-23-2005, 03:00 PM	#3
DangerBoy Registered User Join Date: Nov 2005 Location: Springville, Ca Posts: 270	Re: Need wiring help with blower switch connections I was having the same problem with mine until I checked the heat and AC fuses and the AC one was blown. I swapped it and it blows like mad now. Not sure why theres an AC fuse on a non AC truck though... __________________ 2002 S10 ZR2 for the dirt. 1968 C10 shorty for the street. She said the truck would be the end of us. I still have the truck!

12-23-2005, 03:43 PM	#4
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Re: Need wiring help with blower switch connections Thanks guys. I have it working but only on one setting. From the look of the diagram (thanks John) there is a resistor. Can anyone tell me where it is located (or supposed to be)? Could also be the switch itself I guess. Thanks again



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