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The signal lights and the brake lights usually use the same filament in the bulb. If there is a bad ground on the rear lights, the current can go back through the signal light circuit and cause weirdness to happen.
If the fuse blows you net suspicious of a dead short which allows more current than intended.
I would recommend using a continuity meter and a voltmeter and doing a function check of the different parts of the circuits involved.
Hope this helps.
One last idea...... Has any maintenance been done on the wiring or lights recently? Something had to happen between when it worked, and when it didn't. That's what we're trying to find.
If the fuse keeps blowing, I assume it is because you keep replacing it. Those fuses have given up their lives to keep your truck from burning to the ground. Each time a fuse blows, the wires in the system get heated up and weakened. If you keep replacing the fuse, the insulation will eventually burn off of the wires and light the entire truck up. There is a shorted component or wire on one of the circuits that are protected by that fuse. Replacing the fuse without locating and repairing the reason that it blew, will only result in another fuse having to give up its life to keep your truck from roasting and all the other fuses will have died in vain.
The circuits to that fuse will need to be traced, using the wiring diagrams for your vehicle and the proper equipment necessary for performing tests on your electrical system. Nobody online can tell you what the actual cause of the problem is (other than tell you there is a short) without performing the necessary tests on the vehicle itself.
DASH HAS A SHORT CIRCUIT.DASH NEED REPLACING BUT CHECK FOR SHORTS IN THE WIRES TO DASH.DONT PUT A LARGER AMP FUSE IN A CIRCUIT TO KEEP FROM BLOWING FUSE BECAUSE IF FUSE DONT BLOW WIRES GET HOT IN THE CIRCUIT THAT HAS A SHORT IN IT AND CAUSE A CAR FIRE.
the cause for a blown fuse is a short circut or over load remove the bulb turn light on with new fuse if the fuse blows then you have a short somewhere in th wire trace wire down till you find the short then repair with a **** connector replace fuse turn light on that should take care of your problem & if the fuse dosen't blow with the bulb out replace the bulb