Turn signal fuse blowing

Might look for a pinched or crushed wire. Maybe
replace bulbs & flasher first to rule that out.
I once found the running lights wire smashed
behind the dash (dash lights). Find the color and
follow them through, just like the dealer would do.

 

That's all multi-plexed, other than tracing wires, there's not much you can do without Paccar ESA. Is the warranty out already?

 

usually bad wiring. usually in tail lamp area (becouse of dirt from drives) ore side lamps

just disconnect frame tail lamp wires from cab (connector is under cab) and check fuse.

 

I had the same issue, I replaced the light cord. Problem was solve. And this was after I replace the fuse with a breaker and chased all the electrical. Last resort was the light cord and solve that problem, i bought a phillips cord.

 

On my 2009 Western Star, the repeaters on the hood had an intermittent ground problem. It made the brake lights come on dim when using a turn signal!
Removed the 2 small marker light bulbs and it was OK for a while, but then started it again. Found the bad ground wire on a rivet and redid it with a bolt. Problem sorted.

Martin

 

Follow the wires from the bulbs back to the harness to look for anything suspicious. Unplug any connectors in the line, and maybe disconnect the entire external wire harness, to see if the fuse will then survive to that particular point (locates the fault).

 

Now look up the part numbers on ebay and amazon, to look for any lessons (savings).

 

Beware of cheap copy of parts from overseas !