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Ask Gm Tech (Cam) Your Own Question
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1690
Experience:  GM Grand Master Technician 2007. 14 year experience.
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I own a 2011 GMC 3500 diesel with an integrated brake

Customer Question

Hi, I own a 2011 GMC 3500 diesel with an integrated brake controller. I am trying to test the 7 pin trailer plug. With no trailer attached and the key turned on, what voltage if any should I be getting between the neutral pin and the brake pin?
Submitted: 2 years ago.
Category: GMC
Customer: replied 2 years ago.
With the key turned on in the truck and no one touching the brake controller, I am getting a pulsing voltage reading on my analog multimeter when I have the negative lead on the neutral pin and the positive lead on the brake pin. What would cause this?
Expert:  Gm Tech (Cam) replied 2 years ago.

Hi there, I am Cam. Can I get your first name please? Can you tell me what issue you are facing with your truck? Any warnings? Does the brake system not work at all or on your trailer?