Finally got time to work on this issue. Took the compressor cover off and inspected the wires. Disconnected and reconnected the plugs. Everything looked good. Compressor appears to be relatively new. Next I removed the drivers side wheel well liner. Although the wires are dirty and has a bunch of leaves and crud on them, I couldn’t see any broken or damaged wires.

is the a way I can check to see if there is actually power getting to the compressor? Hopefully this could rule out an upstream wiring failure. Is there a way to jump the oppressor to see if it will turn in with a direct power supply? This would rule out a compressor that is bad.


Tks

 

Basically wondering I’d a multimeter can be used to check the compressor plug is getting power from the battery and if the compressor itself can be jumped to see if it will run with removing from the vehicle.

tks

 

Yes. Jump compressor relay and check at compressor plug. Standard relay, so standard jumper works.

 

So this is what I’ve done:

- jumped the relay
- confirmed power to the relay by inserting the positive multimeter lead into the 5 position of the relay while grounding the negative lead to the engine.
- tried new relay
- unplugged the power cable at the compressor and checked voltage coming from the power side and nothing.

I’m pretty sure it has nothing to do with the relay. Since no power to the compressor, it has to be a broken wire or a short somewhere between the relay and the compressor multi plug.

I have the wheel well liner removed and have inspected the wires the best I could, especially at the multi plug area suggested by the king provided by Dakota Traveler earlier in the thread. All looks good as far as I can see.




But I can’t see the connections on the back side of the multi plugs and I can’t seem to get them apart so I can inspect. The space is very tight. Is there a trick to getting these apart? Only other thing I can think to do is to buy one of those little mirrors on the end of a telescoping handle to try and see behind the plugs.

Other than trying to see behind these plugs to inspect wires, I don’t know what to do next.

tks.

 

To clarify, you had the relay location jumped when testing for power too?

The power for compressor is its own plug in the well, pretty sure the blue one to right. Thicker wires.

 

I did not have the relay jumped when testing for power. I assumed since the new relay didn’t help, it wasn’t the relay. I can try it though. I will jump the 3 and 5 positions and then see if I get any volts at the compressor

 

Yes, of course try it. That way you can maybe get an idea of continuity from the relay to the compressor. If you get voltage, but the compressor does not run when jumped, you could have a damaged wire that can supply a voltage reading but not take a load. Or the compressor is toast.

 

Tried the following:

Jumpered the relay with some wire and got widely varying voltage from 0.2 - 4.5.

Inserted old relay and had 0 voltage

inserted new relay and had 0 voltage.

I’m new to this so to make sure I’m checking voltage right….I have the multimeter set to 20 volts DC and I’m inserting the positive lead into the plug on the red wire side while touching the negative lead to the frame. All with engine running.

 

You should be reading both wires connectors, not sure why you would check against the frame. Engine does not need to be running.

 

Tks. So I need to insert both leads into the plug neg to neg and pos to pos? Getting dark but will try to get this don yet tonight.

I was thinking that attaching to the pos plug while grounding to the frame would tell me if voltage was running through. I stand corrected.

tks