(Red/Yellow)ġ4)Ĝut or remove pin for illumination (red/yellow) and side marker wire (green/red) at H/L switch: Illumination fuse 9B no longer shorted to ground. (Green/Red)ġ0) Test low beam wiring at connector: Both wires 12v with H/L on.ġ1) Test low beam relays L & R and high beam relay: All test good.ġ2) Remove all light bulbs, test connectors: All side light/ taillight wires shorted to ground on both terminals.ġ3) Unplug all switches in car (wiper, hazard etc.): Illumination wire shorted to ground. H/L Switch/ Side marker wire shorted to ground. Replaced unit, no change.ĩ) Remove H/L dimmer relay and test: Relay functional. When the switch moves to park lamps it sends the ground from the green/red wire to the red/blue wire-this is your dead short.ħ) Unplug Tail lights, Side Markers and Head lights: No change.Ĩ)Ĝheck tail light sensor unit: 2 terminals burned. (Red/Yellow) The red and blue wire is power from fuse 9B. Side marker/Tail light grounded (Green/Red), Illumination grounded. Red/ Yellow is illumination.Ħ) Unplug H/L switch, test circuit to ground: Failed. The blue/red wire at the radio is your clearance light circuit and should not be grounded (Changes from green/red to red/blue).
(In front of battery)ĥ) Test H/L switch, dimmer switch, fog light switch, high beam switch and unplug radio: No change. Blue wire)ĭISCONNECT BATTERY you are no longer testing for power.Ĥ) Test fusible links: All good. to bypass lighting circuit.ģ)Ĝheck illumination fuse for short to ground: Found short to ground from fuse to H/L switch. (Yes the massive stereo system and alarm)Ģ) Repair cut and spliced wires in trunk and remove manual tail light switch installed by P.O. Brake lights and turn signals function.ġ) Remove all non-factory wiring and repair all cuts and splices. Illumination/Marker light fuse blows when parking lights are activated. High beams come on when H/L switch is activated. Symptom: No tail lights, dash/illumination, fog light or low beams. This is what to do when you have no idea what the problem is. I use the diode test to get a tone so I don't have to look at it. You can check with a test light by connecting the alligator clip to positive and probing wires. Here's how I found the problem and fixed it in one day. I didn't find a good troubleshooting guide so I thought this might be helpful. This short can occur almost anywhere, so it can be very frustrating if you don't follow the right procedure. I think many of you are familiar with the no taillights, no low beams or dash lights and high beams stuck on high. The first problem to tackle was the lighting circuit. Although I specialize in mostly Italian, German and rare cars I think the Z is the real deal for a sports car, pretty impressive design. Recently bought a 91 300ZX 2+2 to play with.
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