Question about Cars & Trucks
Headlights on freight liners are set in fiberglass bonnets so the system needs return earth wires . Check for insulation failure at the bonnet hinges where the wiring loom comes back into the truck proper. If high beams are not working then neither will low beams if it is a wiring /earth problem. Having checked that out -check high beam relay and fuse for correct operation Check all the fuses for the cabin lights. Check that the cabin light switch is on ( does the cabin light come on when the door is opened)--blown bulbs)
Use a multimeter check for voltage at the light switch in and out to check light switch. Appreciating that you have to keep the wheels rolling it may be best to take it to a truck electrician as most trucks have common faults due to the manufacture and lay out of the wiring systems.
Posted on Nov 13, 2014
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Posted on Jan 02, 2017
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The headlamp circuit is rather simple. From the 15 amp RH headlamp fuse, there is a red w/yellow trace that goes to the RH high beam. Out of the 15 amp LH headlamp fuse, the wire going to the LH Hi beam is solid red. Both of these wires should have power when the headlamp relay is energized. The wires from the Hi Beam bulbs going back to the switch should both be red w/black trace. The wire going from the headlamp relay to power the 2 15 amp fuses is white. The headlamp switch applies a ground to illuminate either the Lo Beams or the Hi Beams.
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