Help with heater needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JimKshortstep4x4 · 09-28-2009, 07:35 PM

#2 wire is for an oil pressure light setup and would have hooked into the block behind the distributor.

#1 wire is for the engine temperature and was probably a "hot" light hookup.

Starting at the heater motor make sure it runs by connecting a 12 volt jumper wire to it.

If the motor runs then check for power at the heater switch, before and after. If no power at the switch recheck the fuse holder connections. From your picture it looks like there is a corrosion problem with the contacts. If power is going through the switch check the resistor block and wiring.

Jim

09-28-2009, 07:35 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Help with heater needed #2 wire is for an oil pressure light setup and would have hooked into the block behind the distributor. #1 wire is for the engine temperature and was probably a "hot" light hookup. Starting at the heater motor make sure it runs by connecting a 12 volt jumper wire to it. If the motor runs then check for power at the heater switch, before and after. If no power at the switch recheck the fuse holder connections. From your picture it looks like there is a corrosion problem with the contacts. If power is going through the switch check the resistor block and wiring. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC Last edited by JimKshortstep4x4; 09-28-2009 at 07:37 PM. Reason: Added wording



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