Electrical gremlins...maybe???

[Mark Craig]

Has anyone had this happen and if so what was the cure??
OK about two weeks ago I noticed the roof top cab lights weren't on, checked the headlight switch, the fuse panel and nothing was off or broken. Then about a week later noticed the 3rd brake light in the rear of the roof wasn't working. Then on a trip last week the GPS won't operate?? The radio and CD player are fine, the GPS just won't ever show a map, just sits there and says "Garmin".

It's a 2013 3500 crew cab 4x4. Any ideas???

 

[Wiredawg]

I recommend disconnect the batteries pos and neg, wait 15 minutes, reattach them and check everything out. With all the automation, this may work. Let us know if that works. I have a 2017 Ram C&C Service Manual (not so much) and can see if common grounding points are listed. FCA eliminated wiring diagrams. Bad, loose, corroded grounds can cause gremlins. Cheers, Ron

 

[jhenderson]

While the batteries are disconnected load test them.