"The tail lights won't work. I checked the fuses and the relay under the dash. I also checked main fuse under the hood."...
I tried everything too and my problem was fuse number 8 under dash was located in the space of fuse numero 9 !!!! ... a " not usted space" according to fuse diagrams, so i put a 10 amps fuse at number 9 space and VOILA !!!
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id bet not. checking fuse by eye is the wrong way,
bad looking sure, are bad but good looking fuses can infact be bad.
we use a voltmeter, it never lies.
the fuse is marked, TAIL, its really parking and all dash illumination lights (dimmable too)
fuses can in fact hair line crack. a fact
if not the fuse, then its the parking system lights failure.
this system is huge, all side lights , front park, tail park
and cab., the FSM factory sevice manual covers this as does
the alldata.com pages, log in and see a real schematic.
see how park happens. from the knob to the lamps.,
some have a relay. on newer cars its works,, one computer tells other to tune on the park relay, be glad that is not your car.
eg: comm errors.
I had an S-10 pickup that had a tail light out. It had two fuse panels one inside the cab and the main one under the hood. They had a fuse for each tail light and it was in the main fuse box under the hood. You'll need a way to check your fuses if you can't see witch one is bad. They were very small fuses in my S-10. Hope this helps
If neither your front or rear lights are coming on I would think it was a problem with the headlight switch. Even if that switch is bad, your brake lights should still work when you press on the pedal. Usually a good indication to determine if the headlight switch is the problem is to see if your dash lights are not working as well. If those aren't working it's usually the headlight switch itself. If the dash lights DO work then your headlight/tailight relay is probably defective. Swap with a similar relay to test.
the rear tail lights, license plate bulbs, and the front park lights are all fed off the same fuse. I show fuse one in the dash fuse block (15 amp). If the front amber park lights are working its not a fuse.
Are you sure the bulbs are good? Have you checked the connections in the harness?
All of these have a fuse but yes the headlight switch is their common source.You may want to check the main circuit fuses first ( Heavy duty ones) Under the hood in a black box. If the fuses are good, your most likely culprit is the headlight switch
I had the same issues. Dash dead, tail lights dead. Fuses were fine, Dimmer relay was fine...So I got to the Tail Light Relay.
Removed the glove box, one screw on the right. Reach up (above the space where the glove box 'area' would be and there are 3 or 4 relays all sitting on top of a junction box. All of them were loose. I pushed them in...and voila! I was getting scared after the obvious.
Left of the steering wheel & under the dash is the fuse panel for this. No.9 is for the tail lights, but also for many other lights such as licence lamp/parking lamp/side marker/tail gate/etc...
There is also an under the hood fuse/relay panel, but it does not have the tail light fuse in it.