Originally Posted by superlucky
I would trace the wires back from the headlight assemblies.
Also, is there any chance that the previous owner replaced the original lights with HID lights, or some other higher amp lights?
Totally agree with tracing wires!
While it is possible that HIDs were installed, they are not "higher amp" once they strike. The initial strike might be twice as much as a standard halogen bulb but that is only for a fraction of a second from a cold start up and no factor once they are fully excited. The fact, they draw lower amps can mess with some headlight control circuits. They are also not compatible with Daytime Running Lights.
The quickest way to see if HIDs were installed is to go to the headlight assemblies to see if there is a ballast installed for each side. However, since this problem seems to be connected to the use of high beams, I'm doubtful that the low beams are the true culprit here.
I'm curious if this is caused by high current when the high beams are selected. If the coach runs all 4 lights when on high beams, excessive current could be possible if after market bulbs of higher ratings than the original specs are used. There is also the possible issue that sub-standard wire gauge was used somewhere in the circuit and also part of the mix. Hey...it is a theory anyway. LOL
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