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What is the voltage supposed to be at the AC cpmpressor plug?

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Old 05-18-2016, 03:12 PM
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What is the voltage supposed to be at the AC cpmpressor plug?
My AC system was discharged by a leak before I got it, Just checking things out, If I Turn "ON' the system at the dash switch, I get 4.5 Volts at the compressor plug, IS this "normal?"
Thanks.
 
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Old 05-18-2016, 03:20 PM
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I don't know... but the A/C isn't going to work without a decent charge, the pressure switch will detect a low charge and will keep the compressor from coming on.
 
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Old 05-18-2016, 03:27 PM
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This is true, and building on that I'm wondering if the voltage increases with the increase pressure of a refrigerant charge.
 
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Old 05-18-2016, 03:29 PM
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I can't imagine so, it's a simple open/closed switch and not a rheostat.
 
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Old 05-18-2016, 03:58 PM
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Seem to recall you can hotwire direct, to see if it will spool up, even if refrigerant is low.

http://www.aa1car.com/library/ac98.htm
 
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Old 05-18-2016, 04:53 PM
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Cool! I hot wired it to the battery and the clutch engages like it is suppose to.
Thanks!
 
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Old 05-18-2016, 05:49 PM
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Schematic is here, on Page 142: A/C & Heater - Gary's Garagemahal. There's nothing in there that is supposed to drop the voltage.
 
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