Bit late here but my peterbilt's wiring on the high beam side was backwards...same issue as regular bulbs worked fine. Switched wires in the plug...
Had similar issue...wires at tail light harness had rubbed through shorting out. Looked for days as would happen intermittently depending on bumpy...
Sometimes it's just the speedo itself...had that problem, went to my local wrecker and they let me swap mine with another used one to see if it...
Changed relays and all seems to working properly now :)
Yes...none of the circuit breakers are popped out.
The light switch on the dash still works as normal, the issue is all 4 lights come on (hi & lo) and toggling the hi beam switch does not turn off...
Hi people, So using LED headlights, haven't had any problems until yesterday. did walk around on my truck and noticed all head lights are on,...
