90 4runner tail light fuse keeps blowing

[gunguy_ak]

Whew, i have a 90 4runner, tail lights were blowing a fuse ever once inna while, replaced the fuse a few times, it fixed the problem for awhile. Now tho, no tail lights at all, and everytime i pop a new fuse in,and turn on the parkin lights, it blows the fuse. Tried replacing the whole headlight switch but did no good, checked all the bulbs, and replaced them anyways, still no good. sandblasted the metal fasteners where the bolts hold the tail light in, still nada, im stumped, and i really hate to turn my runner over to my work, a junkyard. but this problem is driving me crazy. My headlights work fine, a few intermittent problems with my brake pedal relay/switch?, but im sending out this SOS for a tail light fix.

[4Wheel]

Pull the tail light bulb and MEASURE if there is a grounded circuit. Somewhwere there is a short that is causing the fuse to blow.

[Northern Sun]

also, there is a box that all the wiring is going to for whole back of the track, its underneath the panel, whole panel have to go from back passenger seat all the way to tailgate, driver side, hope it helps, N.S

[KimMG]

You are going to have to physically check the wiring from the switch. Look for a pinched or rubbed wire that is causing the short.

[4Wheel]

Originally Posted by Northern Sun

also, there is a box that all the wiring is going to for whole back of the track, its underneath the panel, whole panel have to go from back passenger seat all the way to tailgate, driver side, hope it helps, N.S

Actually the box only deals with arbitration of the circuits concerning the window.
Window motor control, window upper & lower limit switches, defogger control, wiper control, both side latch lock switches, console window switch, tailgate key switch. Relay logic, group of relays and very expensive to replace even with used.

But no tail light circuitry.

Cocentrate on the tail light wiring ONLY don't get overwhelmed by all the other wires, who gives a rats a$$ about em you have a short and should be easy to trace down. but you do need the factory schematics, the after market schems have hideous and misleading errors in them.

You can do this!
Good luck.