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Author Topic: Issue about no dash lights, tail lights, marker lights. 1984 celica gt  (Read 498 times)

Offline ukzxcv

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Hi there , I’m Jimmy.
Tail light fuse keeps blowing.  I found one bad marker light that was corroded so I basically just unplugged it and removed the connector.  But even though I did this,  the fuse still keeps blowing, so there's a short somewhere.  Last thing I did was replace the rear light bulbs.  Brake light work but no rear lights, dash lights or marker lights. Let me know what you think.
Thank in advance.

Offline twotone_ra64

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Hello and welcome! Do you have access to factory workshop manuals or wiring diagrams? I'd suggest going down the circuit toward the power source, checking for breaks or shorts in the wiring.
Celica the '84 Two-tone RA64 - Phase 2 In Progress! (159k); 1UZ-FE V8 Swap, W58 5-speed swap, Koni x Swift x T3 suspension, 6G Celica seat belts, TRD 2-way LSD, Corolla tape deck
Mia the '91 Miata - Revived Twice! (264k); BP-5A 1.8L swap, an NB in NA clothes
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Offline ozzie

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I think you have a short :P

Do you have a soldering iron and/or or a set of alligator clip wires? If not, get some of the wires (harbor freight carries them), a 12V lightbulb (NOT LED!), and a socket to fit it - any old 12v lightbulb and socket will do, as long as they have wires you can clip your alligator clips onto. Trailer lights are usually easily available, again I think HF sells cheap sidemarker lights. Then, take a blown fuse, and break off the plastic off the top around the test points. You can then either alligator clip or solder wires to the top of it, and connect them to the lightbulb. Stick it in the taillight fuse socket. This is now your short indicator - when it's lit up bright, you have a short, when it goes dim, you've fixed it. Now, you can safely turn on the indicator lights and go around the car, wiggling wires, removing bulbs, etc, and checking what makes the short go away until you find the problem. I would strongly suspect a shorted out light bulb, but the tool will help you figure out which one without spending an arm and a leg on fuses.

BTW, I think they sell tools that basically do the same thing as this, but I usually have all the stuff to make the tool lying around (and have lost the last one I made).
'84 Celica GT - 261k mi

Offline sirdan

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Ozzie clued me in on the tip a few years ago, works great! here is a visual aid:

I used a blown fuse and soldered to the two top posts you normally use to check power.
1988 4runner