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Pete, Automotive Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 28280
Experience:  Performed various automotive repairs on several light duty and medium duty vehicles over 15 years of service.
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I am currently trying to diagnose a 2011 peterbilt 387 with

Customer Question

Hello. I am currently trying to diagnose a 2011 peterbilt 387 with a cummins isx. The last six of the seial number is ***** I am having no signal to the a/c compressor relay. I have both hots on relay but no ground signal wire. I can put ground to relay
signal wire and the compressor will engage! I am looking to see what gives the ground signal to the a/c relay. please help ASAP, thanks
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Customer: replied 1 year ago.
think we just figured it out will let you know
Thank You
Expert:  Pete replied 1 year ago.

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.

Inspect and see if you have any broken wiring leading to the relay as this is usually a common fault to cause this issue here on the bigger model vehicles.If any corroded or damaged wiring is found the affected wiring will need repaired to correct this fault.If this has already been checked and found o.k. or if you have already resolved the issue here let me know and we can continue as needed.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.Thanks Pete.

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