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I tested the continuity of both bulbs - both passed. Do both backup lights share a common ground or do they have their own ground ? I see both sets of wires go straight to the middle of the rear bumper area, join up with what looks like trailer lights, then toward the front of the truck
I didn't have much luck looking around the tranny for the bu light switch ..
this is one of those 'drrrr' fixes. I had glanced at the fuse box diagram in the owners manual and noticed that the backup light shared a fuse with the rear running lights, which were working. So I wrote that off as a problem. I looked in the haynes manual and it had the backup light fuse listed with DRL's which my 92 doesn't have. So hot dang, I looked at the 15 amp fuse and sho' 'nuff, it was dead. Replaced the fuse and now I have backup lights !!
oh well, kinda my dummy but no matter how stupid this turned out I believe all solutions should be posted ...
glad it was so easy, a lot of times it is. i never saw another post on bad backup switch that is why i questioned bulbs. oh, and i meant to say "my rear plate grounds were bad from rust under bumper." friends don't let friends post while drinking. hahaha
thanks quick, Another stupid thing - this fuse must have been burned out since I had this truck (about 1.5 years or so). After replacing the 15 amp fuse and woo-hoo'ing after seeing my backup lights work, I noticed, while driving, that it that I DO HAVE daytime running lights. I thought I noticed a time or so that the entire left light didn't work - probably some loose/dirty wire somewhere, which may have explained why the fuse burned out in the first place - I'll double check some of those connections...