2017 Peterbilt 389 glider 389 dome light issues

You have a bad ground somewhere...probably on the battery side of things since you took the terminals apart but check all grounds including one from engine block to frame and battery box to frame. Dome lights only work by completing a “grounded” circuit. Also check your battery cut-off switch if you have one. These are notorious for causing electrical nightmares.

 

Hmm it may just need to go thru several “drive cycles” to clear itself out and reset. My wife’s 2011 Mazda 6 sedan does this if the battery goes dead. The power windows or locks will not work until she completes about 10 start, drive, & stop duty cycles and then BAM they start working. If that doesn’t do it... maybe fuses?

 

It's not the fuses. They are there to simply their to protect the circuit from overload.( High amps)
Without a wiring diagram or actual testing with a multimeter it's next to impossible to know what the problem is. Electrical problems are usually tiny and cause big problems.

 

Yes...like trucker 2211 says...Bad grounds cause all kinds of weird stuff.Even an oil leak saturating aa engine ground to frame strap can cause weird stuff...or even a neg cable that "looks good" but,is corrode under the rugged insulation.Or a clean "but loose" battery terminal.JMO

 

Check ALL the fuses with a test light on the backside. Fuses are not labeled very well and quite often do multiple things, not just what is on the label. Keyless entry fuse is labeled RKE.

 

Might be a good idea to get the vecu scanned, could help point in the right direction, low voltage codes..short or open, com codes, ect.. even flashing the vecu might set things right if its a software issue.