headlights, taillights out - Toyota Nation Forum : Toyota Car and Truck Forums
1st Generation (1995.52004) 1st generation Tacoma information and discussion.

 
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#1 Old 02-18-2012, 12:52 PM
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headlights, taillights out

Taillights went out, then headlights followed-one week apart. For the tail I replaced bulbs and checked fuses and relays. Dash lights went out with headlights. Turnsignals and brakelights work.

I did wire a trailer electrical harness 3 weeks ago, but everything was fine for weeks after this. I am not getting power before the split for the harness.

I suspect it is the switch. Are there other probabilities? possibilities?

Thank you,
travis (this is on a 1996 Tacoma 4X4 3.4 L manual)
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#2 Old 02-18-2012, 03:05 PM
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Maybe a bad ground wire somewhere? I'd check for that, I'm pretty sure that would be the culprit.

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#3 Old 02-20-2012, 11:31 AM
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On your headlights, do your headlight fuses under the hood have power? Your headlighta are always powered up & your switch grounds them to complete the circuit to turn them on.

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#4 Old 02-23-2012, 03:42 PM
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How would I check for power at the fuses? can i get a testlight on them while still plugged in? If no power, does that indicate the switch is bad/not completing the circuit?
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#5 Old 02-23-2012, 03:48 PM
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Humanoid, I dont even know where to start on checking for a bad ground wire. any suggestions ? thanks man
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#6 Old 02-23-2012, 04:29 PM
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Quote:
Originally Posted by RoamAlone View Post
How would I check for power at the fuses? can i get a testlight on them while still plugged in? If no power, does that indicate the switch is bad/not completing the circuit?
You will need a test light to check for power going into the fuses & out, If there is no power going to fuse your problem will be under the hood.

your switch just grounds headlights on high or low, & it grounds tail light relay for power can go thru relay out to tail lights.

buy a test tight, with out it your wasting a lot of your time

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Last edited by burned300; 02-24-2012 at 08:27 AM.
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#7 Old 02-23-2012, 06:54 PM
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Originally Posted by RoamAlone View Post
Taillights went out, then headlights followed-one week apart. For the tail I replaced bulbs and checked fuses and relays. Dash lights went out with headlights. Turnsignals and brakelights work.
That's strange, the dash lights are part of the tail light circuit, not the head lights.
You can check for power to the fuses with a 12V test light or a DMM. Blade type fuses have a built in test point on each side of the fuse where you can check. Have the Ign Sw turned to the ON position before checking.

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#8 Old 02-23-2012, 07:32 PM
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Humanoid, I dont even know where to start on checking for a bad ground wire. any suggestions ? thanks man
I would start with the wiring harness you just added. That seems to be the only thing that has changed. It may have taken 3 weeks for a wire to get worn through and exposing the wire inside the insulation
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#9 Old 02-24-2012, 05:47 PM
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i have continuity across all the splits for the wiring harness, meaning nothing is wrong here including ground. I have no power on either side of right, left headlights and tail fuses under the hood.
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#10 Old 02-24-2012, 06:33 PM
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If there is no power to tail or headlight fuses, there is a maxi fuse (40-80) amp supplying power to those fuses, follow power sourse back to battery you will either find a broken connection or corrosion, or a blown maxi fuse. ,

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