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Originally Posted by blueranger
ok, guys,
the guy said, his ac compressor works fine connected directly to the battery and does not work connected to its source. He also said he reads 12 volts at the source. Well the battery and the source both read 12v. So the only difference is current/amps a car battery can produce 350amps where as the electrical system of a car uses 15 and 20 amp fuses.
So by jumping to the car battery he may be feeding 35 or 40 amps to the compressor and it gives the appearance of working correctly....so a dc amp meter will let you know if you are drawing these high amps...
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You're way out on a tangent here.
The clutch takes
3 amps. There is plenty of current from "the source".
I don't have the schematic for that vehicle, but, it's possible that the clutch is engaged by closing a ground at the CCU. So, he'd have 12V at the clutch all the time, no matter whether the clutch is engaged or not.
It's not an issue of current.