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9V at 7 pin harness

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2006 1500HD.  

I rebuilt a trailer, first time towing it was with an 02 Ram and the brakes did not work (even with the override)

When I got my truck back, hooked it up and same thing.  

I adjusted the brakes (brand new) until the wheel was tight and backed off one notch.  Still no brakes even with override.

I checked voltage at the truck without the trailer plugged in and getting 9V once controller override is pressed, then the voltage drops to about 3v.

I have read that the voltage drops from the speed senors in the wheel not seeing the truck rolling, the brake controller works on a friend's trailer.

Any ideas?  Only thing I can think is the truck has a bad ground to the harness.

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