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02-01-2016, 02:26 PM
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#1 |
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Chance
 
Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Air conditioning Anti Dieseling wire harness
I just got a 1972 Chevy blazer with factory air. I want to replace all the wiring with new harnesses from M&H. I've never had a 67-72 with factory air. I came to the Ac harness section and I have two choices. Non anti Dieseling and anti Dieseling.
Can someone enlighten me on what this is? Thanks!
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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02-01-2016, 05:18 PM
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#2 |
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Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Air conditioning Anti Dieseling wire harness
I believe the '72 came from factory with an anti-dieseling relay installed. It does exactly what it says...briefly engages the a/c compressor when engine turned off in an attempt to prevent the engine from dieseling or running on. Mine doesn't work even with a new relay and good wiring...not sure why.
There should also be a diode at the voltage regulator connector to ensure the anti-dieseling relay is not back feed with power which could damage it. The relay would be mounted on the lower lip of the dash just to the right of the power socket/HVAC control panel. |
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02-03-2016, 10:18 PM
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#3 |
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Registered User
Join Date: Apr 2007
Location: pasadena,TEXAS
Posts: 880
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Re: Air conditioning Anti Dieseling wire harness
here is the anti dieseling relay on my 71
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1971 Cheyenne SWB 402BB, 700R4, 3.73 posi, PS, PB, A/C, Tilt, Tach "Wanda" Don't argue with idiots, People watching may not be able to tell the difference... There's someone in my head........But it's not me...... cheap tricks thread great info here!! http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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02-03-2016, 11:00 PM
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#4 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,703
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Re: Air conditioning Anti Dieseling wire harness
Here is the circuit diagram.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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02-03-2016, 11:09 PM
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#5 |
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Chance
Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: Air conditioning Anti Dieseling wire harness
This is all awesome. Just waiting to clear out some garage space so I can start taking out the wires. Sit down with a bundle of wires, solder, and some beer. Sounds like a good afternoon!
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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05-08-2016, 02:14 PM
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#6 |
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Chance
Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: Air conditioning Anti Dieseling wire harness
Does anyone know what order the wires go in on the Ac/heater assembly? I put in a new under dash harness but my Ac harness is pretty butchered.
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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05-08-2016, 02:15 PM
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#7 |
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Chance
Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: Air conditioning Anti Dieseling wire harness
Here's a picture behind the control switch.
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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