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older vehicle, always make sure the ground is good to light assembly. if no power on wire side, follow wire to harness and look for break, pinch, corrosion. You can always run a new wire from other sides light by using quick connecters (only use them inside vehicle away from elements). sight unseen, I'd guess bad ground or corrosion.
you can simply look at the fuse. There is a zig zag portion inside the fuse that you can visually check for breaks. A break means its bad. or you can use a multimeter and check for continuity; this just means that electricity can flow through the fuse. and lastly you can use a cheap 12 volt tester to probe the fuse; connect the aligator clip to a good ground source- test with key on. Replace fuses with the same color ( amps)
Check for battery to motor ground and battery to body ground for corrosion under mounting bolts. also check motor to body ground strap for corossion and overall condition. Bad ground can cause all sorts of problems. Also check all electrical connectors to glow plugs for corossion.
The fuse box may have gone bad and your getting electrical shorting. Check the fuse box under the hood that may have gone bad and may need to be replaced, look for corrosion where the fuse goes into and the wire harness. Don't know if you had your car since new, but there are a lot of cars from the Katrina Hurricane that was under water and the electrical system have major corrosion that should just be showing up now. Good luck and keep me posted