Re: I got a short some where.
Search the forum here for an address to schematics for your car if you cannot find a Haynes manual for the car. This will help immensely. Also, check to make sure there are the correct part number bulbs in all locations, including interior lights, first.
Next item I'd check is to see/research if the headlamp fuse is of the correct value. It may be as simple as the wrong size of fuse. I'd also get a 30 amp circuit breaker to substitue for the fuse only while troubleshooting this problem, this will save on fuses. Also, having the correct bulb(s) part numbers help.
If I read this correctly, you turn on the headlights, low & high beam, which turns on side markers, parking lights, and instrument panel lights, everything is okay. Then, you turn on the interior light(s) and the fuse blows. But, if headlamps are off, and interior light(s) come on, then everything is okay?
Providing the above statement is correct, then I believe the fuse may be the wrong value. Or, the electrical connections from the battery to the headlights via the headlamp switch may be corroded and need cleaning. Alcohol and a wire brush will help here. If a connection has soon corrosion on it, it will be hot to the touch meaning this corrosion is resistance to current and forces an extra load thus blowing the fuse. Two places to clean are the junction block on the radiator support next to the battery and the buss bar on the horn relay under the washer bottle on the rad support.
The other thing you might do, is to open the doors, unscrew the dome light switches in the doors, you may want to remove the battery ground cable, and isolate the switches with electrical tape. Hook up the bat cable, and turn on the headlamps. Then rotate the headlamp knob to turn on the interior light(s) and wait to see if the test circuit breaker trips. You may want to remove the interior bulbs to see if the c/brkr still trips. If the c/brkr still trips, then it may be a crushed wire from the ight switch to the left kick panel to the driver A-post to the interior socket or in the door switch wiring.
If you have a DVM, it will have capacity of measuring up to 10 amps. You might do an addition of current of all bulbs, when doing this, unplug or unbulb the headlamps to do the parking lights and measure. Unplug parking lights and do one headlamp and measure. Unplug the one headlamp and do the other headlamp and measure. Unplug all lights and do the interior light(s). Add up these values and the fuse is sometimes 50% more than what is required. Sometimes.
You need to get a manual and see what value fuse should be installed.
Think logically and clean the grounds as well, they are the return path.
If worst comes to worst, remove the interior bulb(s) and equip the interior with a flashlight........Ha!
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