headlight problem on a 99 superduty
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Joined: Oct 2004
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From: lost angels
headlight problem on a 99 superduty
truck was in a crash few months back finally got a new header for the front last week so when i swapped it out today one front light low beam dosen't work or the front turn signals either anyone have a wiring diagram for it or could tell me the fuse number
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Joined: Jan 2001
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From: Virginia
For both high and lowbeams, there is a fuse #13, 30 amp in the fuse box under the hood.
Fuse #9, 10 amp is for the left lowbeam, Fuse #11, 10 amp is for the right lowbeam. Both of these are also under the hood.
Fuse #16, 15 amp is for both high beams, and is located in the fuse box under the dash.
For the turnsignals, check fuse #1, 20 amp and fuse #23, 10 amp in the fuse box under the dash.
Fuse #9, 10 amp is for the left lowbeam, Fuse #11, 10 amp is for the right lowbeam. Both of these are also under the hood.
Fuse #16, 15 amp is for both high beams, and is located in the fuse box under the dash.
For the turnsignals, check fuse #1, 20 amp and fuse #23, 10 amp in the fuse box under the dash.
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Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
Thre is one flasher relay. It contains the flasher for all turnsignals and the hazard function flasher too. The manual says it's located in the instrument panel relay block, which is supposed to be located near the instrument panel, I assume under the dash somewhere.
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Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
I would say your multi-function switch is bad(the turnsignal switch) but since you had a crash, and I guess they worked before the crash, then it must be something else up front. Do your dash turn indicators work? These indicators use the same wires and circuit that the front turn lights do. If the dash turn indicators work, then that would point to the turnsignal switch being good, and there is still something wrong with the wiring up front, possibly a grounding problem?
