2014 GMC |Sierra - No rear left/Right turn signal, no driver side brake or running light

[K Palmer]

i currently have a rear left and right turn signal failure and no running light and brake light driver side. it all started after i washed under  my truck. i have check the fuses and they are all good. put in new bulbs and still same issue. also have disconnected the battery for over a half hour and still same issue. ive tried to clean all the contacts with cleaner and still same issue

 

help please

 

 

 

 

[CrawlSlow]

Check fuse. Might have pop a few. Also if you have air compressor,  blow at all the connectors under the spare tire. Try to get all the water out.

 

Edit. Did you use a pressure washer? If not, you shouldn't have issues washing under the truck. 

Edited September 26, 2021 by CrawlSlow

[K Palmer]

I did use a pressure washer. I’ve checked all the fuses and they are good however maybe I’ll change them anyway 

[CrawlSlow]

Unplug all your plugs under the spare tire and blow air in it or let it sit for a few hours before connecting it back in. You must of got water in the plugs.

[MikeBMW]

21 hours ago, K Palmer said:

I did use a pressure washer. I’ve checked all the fuses and they are good however maybe I’ll change them anyway 

I always use a pressure washer clean the underside of my truck and never had an issue.
Still, as @CrawlSlow mentioned, it's worth checking out.