Well like the title says my back up lamps blink on only with the right turn signal. I've changed EVERYTHING associated with the turn signals. No luck. It's really pissing me off.

I going to go through all the grounds to see it they aren't corroded. Tail lights where clean and dry, no moisture or corrosion.

Any suggests would be greatly appreciated.

1993 K1500 Blazer Full size of course.

 

sounds like grounds to me.. they should be right back behind the tail light assembly. pull them off and clean them and see if that does it

 

I'll definitely do that after in stops raining. At least I get to enjoy my dirt bike know, no more dust to kick up. Neighbor called cops on me for that, haha!

 

I figured it out, since it has the tow package it has the extra pig tail for the trailer lights. Some donkey spliced in the back up lamps with the turn signal. EEYAH, guilty as charged.

 

That would do it!