07 F550 high beams dont work - Ford Powerstroke Diesel Forum
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Old 02-13-2013, 06:37 AM
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07 F550 high beams dont work

our one 07 F550 i noticed some cold mornings, if i turned the high beams on, all headlights go off.. so instead of high beams, you have no headlights.

usually after a while, seemed when it warmed up after a half hour they worked.

Then one day 3hrs after driving, high beams were on and suddenly they just shut off...

We went out snow plowing in a storm with the boss plow, which uses a bypass plug, to turn off your headlights when you have the switch flipped so the plow headlights only work... Well the truck was sitting there for 10 minutes, i hop back in, look up and the lights suddenly turned off, all headlights on the plow. so i put the low beams on, no low beams.

now the plow has no low or high beams but the truck has low beams "HID" but no high beams. any suggestions?

I touched and pulled on all wires associated with the headlights and the plow harness plugs to see if the lights would turn back on or flicker. nothing.
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