a/c question

[Supraboostin]

the wire the comes from the magnetic clutch relay to the clutch on the compressor,is that suppost to be 12v or ground?

 

[jetjock]

12 volts. If you look closely you'll see where the clutch is grounded.

 

[Supraboostin]

for some weird reason my cable is getting ground instead of 12v.From the 2 wires that go on the clutch,is one a 12v and the other one ground right?

 

[jetjock]

There's only one wire that "goes" to the clutch, the 12 volt one from the relay. The other wire coming out of the clutch should be connected to the compressor itself as a ground. How are you determining the wire in question is ground? If you're measuring ohms that's not going to work. It'll show as ground because the clutch is nothing more than a coil.

 

[Supraboostin]

well i disconnect the cable and connected one terminal from the voltmeter to the 12v side from the battery and the other one to the cable and it showed 12v,im i doin it wrong?not too good on electrical so thanks for the help

 

[jetjock]

Yes, you're doing it wrong. Connect one side of the meter to the wire and the other side of the meter to the engine block or compressor itself. You can also use battery negative but it's always better to check the ground at the device itself, in this case the compressor. The key and AC need to be on. The engine does not. What's the problem? No clutch engagement? Check the dual pressure switch on the fender to be sure both are closed.

 

[Supraboostin]

Yes, you're doing it wrong. Connect one side of the meter to the wire and the other side of the meter to the engine block or compressor itself. You can also use battery negative but it's always better to check the ground at the device itself, in this case the compressor.

What's the problem? No clutch engagement? Check the dual pressure switch on the fender to be sure both are closed. Measure the clutch wire referenced to the engine block for 12 volts with the key and AC on. The engine doesn't have to be running to troubleshoot any of this.

well yea i tried that but doesnt give me a reading,it only gives me a reading when i connect it to the 12v on the battery thats why i said its giving me ground

 

[jetjock]

Well, that's the way it needs to be done. You're just going to have to track it down. I repeat, check the continuity on the dual pressure switch. It's possible there is no refrigerant in the system. If so the clucth won't come on.

If you want to check the clutch itself jumper 12 volts from the battery positive to the clutch wire. Don't try and run it that way though. Just check to see if it pulls in.

 

[Supraboostin]

yea i tried that and it does pull in so i guess i have to trace the cable to see why its grounded