Have Classic Car Questions? Ask an Expert.
Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!
ok so when you disconnect the connector i want you to measure from the ground wire to engine ground and tell me the resistance, it should have very close to 0 ohms. if any. lets make sure the ground side is good.
ok so it is possible the meter is switching to voltage drop, you said the wiring is new correct? what about the other end does that wire go to a switch ? i have to see if i can find my diagrams.
ok i see a black ground and a dark green power wire at the compressor ? confirm?
OK GOOD DEAL
it goes to a thermal switch and comes out a tan wire.
so lets bypass that switch and see if the compressor works , we can have a faulty or weak thermal switch.
then its the wrong switch, follow where the dark green power wire of the compressor goes. there is a thermal switch that opens the circuit when the wiring gets hot from compressor activation.
ok, so far so good. then after that the wiring goes to the ac switch on the panel. the lever that you slide to get the ac on. we need to bypass there as well, and see, this is the only way we can determine where the voltage or amperage is lost, what kind of fuse does it use? the oem glass fuse in the fuse box?
OK, so far so good we are at least eliminating items. all news is good news.
let me as you this, when you are testing the available voltage when the compressor is hooked up are you checking from the positive wire to the chassis ground on the engine or are you testing across the connector pins positive and negative?
what if you wiggle the connector on the compressor, maybe the terminal is the issue right there at the compressor, another test would be to get a light bulb socket or light bulb and use that as the load, lets see if we get the same issue with something else connected to that connector, do you know where i am going with this?
ok, so do the test i just posted, lets see if a light bulb would be dim or bright, just to confirm its not the compressor and its the vehicle side.
here is the diagram i am referring to , it does say 68 but should be for all models of that era.
Sorry I will opt out and let another expert help.