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Old 10-11-2014, 01:31 PM   #1
FireDave
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Join Date: Sep 2014
Location: Waterloo, Iowa
Posts: 7
Brand new & need help with my heater

Just got my 72 K20 custom home last week. PO said needed new fan switch, put one in and nothing. No power from harness that plugs into switch. Been at this for about 3 days now. The harness only has 3 wires that plugs into switch with 4 blades. Anyone know where the power comes from? All fuses in block are good, is there something inline?? Wireing was/is still a mess from P.O. Any help would be great!
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Old 10-11-2014, 02:41 PM   #2
Prescott
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Join Date: Jun 2013
Location: Prescott AZ
Posts: 31
Re: Brand new & need help with my heater

I can't tell you off the top of my head where the power is supposed to come from, but I do know that wiring diagrams and schematics are available for your truck. Wiring problems can be frustrating, but the answer is there somewhere. It reminds me of when I learned that the diagnosis of a PO who couldn't fix it might not be right. Take a breath, drink a beer.
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Old 10-11-2014, 06:54 PM   #3
Hutch
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Join Date: Oct 2001
Location: Grapevine, Tx.
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Re: Brand new & need help with my heater

FireDave
Maybe this link will help
http://67-72chevytrucks.com/vboard/s...d.php?t=580612
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Old 10-11-2014, 07:17 PM   #4
FireDave
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Join Date: Sep 2014
Location: Waterloo, Iowa
Posts: 7
Re: Brand new & need help with my heater

Thanks guys, everything helps. This place is a great resource! I pulled the fan today It maybe toast too. The way it's going it will all be new when I'm done.
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