Start testing direct at the incoming harness with a test light and verify all your signals and lights are working to that point.
Tail light harness junction block silverado.
Tail lamp block gm item weight 4 8 ounces product dimensions 5 13 x 3 75 x 1 31 inches item model number 923 012 exterior ready to paint if needed manufacturer part number 923 012 oem part number 1p1730.
Age heat or moisture can cause shorting and corrosion on the tail light circuit board and you may notice bulbs not working or coming on when they shouldn t.
The only tools you ll need are a 13mm wrench screwdrivers and some penetrating oil.
Another thing to try is pull all the plugs out of the junction block.
The tail light circuit board is mounted in your tail light housing and usually includes the plug for the wiring harness and the bulb sockets.
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If the left side is fine i know that the wiring to the rear junction block is okay.
This is the same for a lot of different gm trucks.
Iff all works at that point then plug the main back in and start testing at the left and right plug ins on the junction block.
Okay if you are having some problems with your rear lights.
With a 13 year old truck am i wise to just replace both sides wiring harness and the juntion block or is that just likely a waste of money.
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Apdty 756760 wiring harness pigtail connector 7 way wire leads fits tail lamp or instrument cluster junction box on escalade avalanche silverado sierra suburban tahoe yukon h2 replaces gm 15306339 acdelco 88986855 gm original equipment passenger side tail light wiring harness.