I have a 1997 grand marques that when I replaced a fuse it blew everything in the car far as lights radio brake light head lights etc.

SOURCE: 1997 Crown Vic blows radio fuses

Try checking all the grounds for the radio, over time they can weeken. If that doesn't work, put in a new ground wire with a heavier gauge, that should fix it. It sounds like a ground problem.

Good luck, Daniel

SOURCE: # 4 fuse blew out,

I KNOW YOU HAVE AN ELECTRICAL SHORT.WAS AN ALARM INSTALLED OR ANY OTHER TYPE OF ACCESSORY? CHECK WITH DODGE TO FIND OUT ABOUT A RECALL.IF SOMETHING WAS INSTALLED, TAKE IT BACK THERE TO STRAIGHTEN IT OUT IF NOT HAVE A AUTO TECHNICIAN CHECK IT FOR YOU.

SOURCE: T100 tail lights & dash light keep blowing fuses

If this vehicle has a trailer harness, that could be the problem; it could be shorted out. Additionally, if there is no trailer harness, look under the truck bed at the rear, look for a grey wiring connector that wires come out of, and run to the taillamps. I have observed corrrosion in this connector, which will result in a short circuit. You may find it necessary to cut the connector out and resplice the wires back together (eliminate the connector), if severe corrosion is indeed present.

SOURCE: 1993 jeep grand cherokee limited no running lights/tail lights.

Id look at the headlight switch and do some voltage tests to see whats coming out of there. Pay close attention to any wires which look like someone was in there already.People can mess stuff up faster and better than the vehicle can by itself!

SOURCE: Just recently my 98 Toyota Corrolla has started blowing a fuse.

I would remove the dome light, and disconnect the wiring connector, and then put in another fuse. If it does not blow, I would think that the dome light switch is shorted to ground.