Thread: 89 rangie air con compressor wires

No AFAIK one is an earth. The one that comes via the switch or switches on the receiver dryer will be the trigger wire.
Regards Philip A

test it with a test light.multi meter shows 12volts on both sides.

i think its feed back 12 volts maybe from the ecu or a fan relay.
or you got a fried diode.these normally run of a relay in the fuse box and some earth through the low pressure switch.

i think the overheat switch is on the earth side of the coil.?'maybe.
it isnt on other sanden compressors.

if the diodes are not present in the harness-the coil will work either way [it works slightly better the right way]

the system is junk and realy needs a wire cutter.

here is thewiring diagram for a 87 which should be the same as 89. One wire is power , one is earth. They should be different colours.

Regards Philip A

Sorry that didn't work. I will try this.

Attachment 41871


Power should be Black green and earth black. It looks like someone has changed the wires .
I just had a look at a picture of mine and it has 2 red wires at the compressor, but go a bit further back and you should see the correct wires.

Regards Philip A

[Power should be Black green and earth black. It looks like someone has changed the wires .
I just had a look at a picture of mine and it has 2 red wires at the compressor, but go a bit further back and you should see the correct wire]

Got it . Great thanks .
Can you tell me where the relay is for the compressor . If its in the bank in the engine bay I dont know which relay is for what function . I have a bank of 6 or 7 in there .
Regards Mark

I am pretty sure they are behind the driver's side kick panel.
Regards Philip A

Originally Posted by PhilipA

I am pretty sure they are behind the driver's side kick panel.
Regards Philip A

Thanks for your help I will look further into this .

if its has a sanden piston pump on the driver side and power is on both wires.
check earth wire for the condencor fan.

My hiline is an 1989 and these are like a dealer fitted AMC system.
I was thinking before you had a later vehicle with a TR scroll pump on the left side,.