Need 1998 mitsubishi 3000gt wiring diagrams

run a wire from the tail lights to the plate light . if this works the wire to the plate light is broken , if not replace the light socket

This is not necessarily your dimmer switch. Most manufacturers tie the dash lights to the tail lights so that it warns you in a visible way if your tail-lights are not working. It sounds more like you have a power supply problem unless working the dimmer switch actually causes or resolves the problem. Chances are you either have a shorting power wire, or a mostly broken wire that is only making an intermittent connection. If it was constant I'd suggest checking fuses but with an intermittent issue, The only way to really check this is to start tracing wires and testing power along them when it's not working. Wiring diagrams help a lot.

Find where the ground wire for that left taillight grounds to the body remove the screw and clean that ground, otherwise if the taillight assembly uses a printed circuit could be a break in the printing, replace the whole assembly if thats whats going on.

Hi
There are a couple of wiring diagram and manual available on the net. The relay you are talking about is the park lamp relay which supplies power to the tail lamps, license plate lights and both front and rear park lamps. If the park and plate lights are working the light switch, relay and supply power are good. You need to verify for a broken brown wire to the tail lamps (assuming the sockets, lamps and grounds on both tail lights are good) .If none of the lamps are working then the 15A fuse number 3, the light switch or the park lamp relay could be bad (note different contact in the main light switch work the other lights)

You can find a wiring diagram and component location at
www.autozone.com and http://www.pdfgeni.com/book/1998-ford-ranger-wiring-diagram-pdf.html

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your power starts at the brake light fuse,check with a test light,then proceed to stop light switch on brake pedal under dash,one wire will be hot when when you check it with your test light, the other won't be until you press down the brake pedal then the power flows through to the second wire,if no power to second wire replace switch,if you have power remove tail light bulbs and check for power in side socket.

Check your tail light fuse, on the dodge ram the dash lights and tail lights use the same fuse so if the tail light fuse blows your dash lights will go out to alert you of no tail lights.

If you are unable to find the answer here, try your local library. They have every mechanical diagram for every car in alphabetical order. This is what I needed to do when the dealership wouldn't print off the wiring diagram for my VW Passat.

this sounds like the headlight switch itself.

Is there a roller or switch to adjust the dash light brightness? Have you just accidentally bumped it when doing the stereo install and switched it off? If not then it's likely that you have blown a fuse while wiring up the stereo. The easiest way to check fuses is to buy a cheap test light from any auto parts store and hook the clip lead to an exposed metal part of the body (door hinges are usually good) and probe each fuse at both of its exposed terminals (without removing the fuses). The test light should light up on both of the terminals, if it lights up on only one then the fuse is blown. If it doesn't light up at all then the circuit does not have power to it. This test should be done with the key in the on position. Also, the fuse box cover may have pictures of the relevant circuits on it, and you may be able to figure out from the picture which is the fuse for the dash lights and just pull it and visually check it.

sounds like a failing main wiring harness.