Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
do the front parking lamps work ?
it is just the rear parking lamps and tag lights not working ?
these are very common for bad park lamp relays or the relay terminal connections in the under hood fuse box or connections or wiring issues under the under hood fuse box and a few that mice will chew some wiring under the fuse box
since the fronts will always work fine these issues would then come down to the wiring under the under hood fuse box OR the terminal in the connection under the under hood fuse box that runs to the rear parking lights being a bad connection or on the under of the rear frame the junction block where the rear lighting wiring all connects with a bad connection
as for exaclty which it is on your truck is hard to say when they are working now
i would check under the under hood fuse box for any wiring damage if it looks good unplug the connections under the fuse box that plug into it and pack the connectors with dielectric grease then plug them back in then get to the rear lamp wiring junction block under the rear of the truck and do the same with the dielectric grease on those terminals and connections
the odds are that will correct this intermittent problem you are having
it is just called dielectric grease
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how are you making out ?