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Now it keeps blowing the compressor fuse

mhfd112 on Sun August 22, 2010 6:54 PM User is offline

Year: 2003
Make: Cheverolet
Model: hd2500
Engine Size: 6.2

I posted here about this truck a while back. Put the new compressor and belt on and has been working good for nearly two weeks. Now it is blowing the compressor fuse as soon as the key is turned on. Does this mean something in the compressor clutch coil has shorted out? It blew the fuse once while I was charging it. Put in a new one and all was well until today. I checked the wires where they plug into the compressor and everything looked ok.

Dougflas on Sun August 22, 2010 7:09 PM User is offline

disconnect the compressor. See if the fuse holds. Check the clutch for short to ground.

mhfd112 on Sun August 22, 2010 10:02 PM User is offline

Fuse didn't blow with compressor unplugged.

Guess I'll be putting another one on.

Thanks for the help.

iceman2555 on Mon August 23, 2010 2:15 PM User is offlineView users profile

Instead of wasting your time and someone else's money....returning a compressor that may not be defective...why not perform some diagnostic procedures...find out what the darn problem is.
Some of the GM compressors have a diode built into the wiring harness...perhaps...there is an issue with the diode....or with the vehicle wiring.

The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

mk378 on Mon August 23, 2010 3:04 PM User is offline

Measure resistance of the clutch coil, if less than 3 ohms the coil is shorted. And like Dougflas said, if it's a 2 wire coil, check for ground fault. Neither terminal of a 2 wire coil should have a path to ground with the harness unplugged from it.

mhfd112 on Tue August 24, 2010 9:07 PM User is offline

Thanks for all the help. I will check it with an ohm meter in the morning.

mhfd112 on Wed August 25, 2010 6:20 PM User is offline

There was a direct short from compressor terminals to ground. After I got the compressor off I found the problem. There is a small bracket that holds the wires down on the compressor. It was so tight it cut throught the insulation. Replacement compressor is on and all is well again.

Thanks again.

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