Likely culprit is bad oil pressure sending unit.
My mechanic was able to replace it without removing the intake manifold...his trick is to deflate the front tires to allow easier access to the top back of the motor.
The other big difference is you get the 3.08 rear end as opposed to the 3.42 Performance is noticeably slower. Drive it and make sure you are comfortable with the pickup.
Test at the socket first. Then check your plug side on the trailer.
Also - are you testing the lights with the trailer hitched to the truck? If you aren't, you may have an issue that shows due to the ground not being complete all the way to the trailer.
My boat trailer has a 5 way flat. I...
On the 10, I used the V1 hardwire kit and tapped into the black yellow wire on the passenger side of the dash.
On the 08, I'm using the mirrortap.
I'll try to get some pics tomorrow.
You can also tap in to the yellow/black wire on the right side of the dashboard, behind the removal trim piece.
If you are installing a radar detector, you can pick up a cord that can tap into the mirror/onstar harness. I installed one on my 2008 and it works perfectly. Look for Blendtap on...
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