15304995 hollander number 166 2129l 166 2128r cover included tail lamp block gm.
Tail light harness junction block silverado.
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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.
Start testing direct at the incoming harness with a test light and verify all your signals and lights are working to that point.
The signal light and brake light work just not the running light on this side only.
I went and bought 2 new bul.
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.
This is the how to install replace taillight harness junction block silverado of a graphic i get via the 2003 chevy silverado tail light wiring junction box collection.
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Another thing to try is pull all the plugs out of the junction block.
There are two bulbs both are dual element and i figured it was strange that both went at the same time.
Recently my passenger side tail light only the running light bulbs went out.
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If the left side is fine i know that the wiring to the rear junction block is okay.
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