AC Pressure Switch Plug Wiring - Dodge Cummins Diesel Forum
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post #1 of 6 (permalink) Old 04-20-2019, 01:12 PM Thread Starter
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AC Pressure Switch Plug Wiring

Long story short, last summer the engine in my truck let go (no compression on number 1). Bought a used motor to drop in to get the truck back on the road as fast as I could (work truck/daily driver) while I rebuild the original engine with a little fun built in. But, that's a story for another day.

When I recieved the used motor the plug for the AC pressure switch/transducer was broken and I had to take the plug shell from my old motor and put it on this harness. AC will not turn on with the "new" motor installed. Now before I swapped the motors my AC would turn on. Wouldn't work great but turned on at least. So now I'm spending time in the shop to see if I can get this all worked out.

I can jump the AC clutch relay and the compressor engages so I know the the circuit to the compressor clutch is good. Now I need to check the control side. Does anybody have access to a diagram or even just the pinout of the pressure switch plug?


2005 Dodge Ram 2500 QCSB 4x4, 5.9 Auto, 2.5" Rough Country level, 35x12" Cooper Discover AT3's, 8'2" Boss VXT-Blade, DTT Billet Trans, Goerend Billet Triple Disc Converter, Autometer Gauges, Silverline 4" TB, 20" Grote LED bar
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post #2 of 6 (permalink) Old 04-21-2019, 06:05 PM
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Have enough refrigerant in the system?
Whatís the static pressure (without compressor running) ?

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post #3 of 6 (permalink) Old 04-21-2019, 06:25 PM Thread Starter
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Yup, that was the first thing I checked. Recovered 1LB 12oz, recharged with 1LB 14oz. Static pressure was around 90psi on high and low if I remember right.

The fact that it the AC would run with the old motor and I had to change the plug end is making me think that I have the plug wired wrong. Or a harness issue on the new motor.

2005 Dodge Ram 2500 QCSB 4x4, 5.9 Auto, 2.5" Rough Country level, 35x12" Cooper Discover AT3's, 8'2" Boss VXT-Blade, DTT Billet Trans, Goerend Billet Triple Disc Converter, Autometer Gauges, Silverline 4" TB, 20" Grote LED bar
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post #4 of 6 (permalink) Old 04-22-2019, 04:20 AM
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Try looking for your plug call outs here.

Mopar Connection Repair Kit

or here.

http://www.rambodybuilder.com/year.pdf

2006 Dodge Ram 3500 QC/DRW Sport
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post #5 of 6 (permalink) Old 04-22-2019, 06:38 AM
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http://www.rambodybuilder.com/2004/d...42/8W-42-9.pdf

Should be the same for 2005.

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post #6 of 6 (permalink) Old 04-22-2019, 11:08 AM Thread Starter
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That's exactly what I was looking for, thank you very much!

Hopefully can get this AC up and running. Went last summer without it, can't do another summer without.

2005 Dodge Ram 2500 QCSB 4x4, 5.9 Auto, 2.5" Rough Country level, 35x12" Cooper Discover AT3's, 8'2" Boss VXT-Blade, DTT Billet Trans, Goerend Billet Triple Disc Converter, Autometer Gauges, Silverline 4" TB, 20" Grote LED bar
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