Question about 1990 Jeep Wagoneer Limited

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My taillights are shorted out somewere and i cant figure it out everytime i put a fuse in it works until i pull the headlight switch out and then it pops the fuse my fourways blinkers and both headlights work and brake lights. also dash lights are shorted.and my side markers do not work

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  • Richard Scordino May 11, 2010

    That's something that you will need to track down "hands on" I'd remove the rear bulbs and see if the fuse still blows, then unplug the harness for the directional switch under the dash on the column and repeat test. Keep unplugging items that are related till the fuse stops blowing, then look into what has failed in what you last unplugged. It sounds like a possible signal switch problem, but without being there I can't be sure. I've seen crazy things like a filament in a bulb crossing into another circuit do similar things...rare, but when it happens it can drive you crazy. The headlight switch could also be internally shorting. One thing experience teaches is that a theory is good but if you don't test to verify, something always gets by you.



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The headlight power wires are probably touching the taillight power wires.

Posted on Jan 11, 2010

  • alex_henders Jan 11, 2010

    because they dont short until you turn the headlights on right?



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Okay, these are hard to find. I assume you have no problem when you do not have the Tailights on? This would mean problem could run all the way to rear taillights.

But if the problem is not related to putting power through the wires to the taillights it is under the dash area. You would have a short from the power supply to the lightswitch. You have a Relay for the lights in the Powerbox.

Go to Website and register your vehicle for a free wiring diagram and Powerbox layout.

You can then see for yourself about how the dashlights are grouped with the taillights. You could have a bad Relay.

Look at how the taillights get their power and this will show you a color/coded path from the front to rear of your car. As I said earlier, it is important to know if the lights only short when they are turned on by the headlight switch.

If they short out all the time, regardless of the headlight switch being on or off, then the short is more towards the front, between the dash and Relay or the Relay itself.

Use the built-in cutoff points as a way of eliminating the shorted part. The headlight switch is a cutoff point. Power rearward is halted with the except of the Brakelights. If the Brakelights work fine, the bulb sockets are probably grounded properly.

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Park lights,license lights will not go off, they stay on dim all the time

pull the taillight fuse see if it's off if not pull the other
fuses one at a time chk lite put fuse back if the light
go's out the the fuse in your hand controls the circut
that's feeding power to the tail lights this should
narrow the field a bit when checking fot a short most
shorts accur at connections + where wires are not protected by the harness wrap.
start at the rt. taillight(it gets fed from the left)to the
plate light to rtl. forword from there checking all grnds
along the way.
with that said if you pull the tl fuse+it go's out.
locate headlight sw harness at base of collum and
with a test light or meter check the wires for power
there should be 1 with constant 12v going in but with
everything off 0v coming out if there is it could be the
I should have said this first but if you have any aftermarket alarms or remote starter sys.start there.
hope this helps any other ? gimme a shout
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I had the same problem - the headlight switch was bad. It was drawing too much current and melting the plastic. Solution was to get another headlight switch from the junkyard. Then I used a dremel tool to remove the plastic from the area that kept melting. No problems since.

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tnx 4 using fixya,


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