Voltage Loss

Krakka, Mickey J described it better than me. Do it his way. He must have submitted his, while I was writing mine.
Fred

Relay does click when removing/inserting fuse. Relay and compressor fitted by major 4wd network over six years ago. Compressor working fine.
Krakka

It should be wired like this:
Image Could Not Be Found

If it is, then the relay is probably faulty.

sorry about the upside down text and poor quality.

Fred B that is one the best techo drawings I have seen, and I aint taking the mickey, good on yer for doing it.

If the relay is clicking when you put the fuse in (If wired as per the diagram by Fred B), then something strange is going on. A relay is just a switch that is triggered by another switch, to allow little switches inside the cabin, and the big switch to be under the bonnet, near the power (Battery) and load (compressor). So if removing the fuse that supplies power for the load makes the relay go off, something is amiss. If it is not the relay, I would be checking carefully for good grounding. THe relay is normally earthed, so when the cabin switch is turned on, it completes the circuit. If this earth was faulty, it may cause strange behaviour. Good luck, let us know what you find.

Cheers

Mickey

It is a $15 meter Paul, I can't expect too much I guess, But as an indication it gave me an idea of where the problem lies, i hope.
Krakka

Krakka, the exact readings with the meter aren't important ( you now know you have leakage....so it needs fixing )

Take out the relay....take it to an auto lec and get another and if not sure how to wire it....ask him to write down the proper numbers to connect it.. almost sounds like the power feed is connected to the coil and the dash switch is switching the load (compressor ?? ) but is very easy to check that sort of thing !!

Thanks Gronk, will have a muck around tomorrow.
Krakka