Are the rear lights combined? ie sidelamp and brake lamp in one bulb .if so, there is a possibility that the bulb is not sitting correctly in the holder , causing both the side & brake lamp fuses to blow . if they are seperate bulbs you probably have ashort in the sidelamp system somewhere but the brakes could be a switch problem [easy check, find switch ,disconnect wires short across using wire or paperclip switch on ignition and check lights ] if they work the switch is the problem , [check fuse first] if they don't
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you have a short in one of the light sockets or a worn wire from the wiring harness. could be the flasher assembly. are the turn signals different bulbs from the brake lights? Does using the brakes blow the fuse? (Rear lights or brake light switch on brake pedal). left or right turn signal blowing the fuse will tell which side has the short. 4 ways only, replace the relay.
first mistake you make is to increase the fuse capacity to above that required. You have a short in the circuit and by putting such a large fuse in you run the very real risk of burning the wiring loom. Check the bulb sockets and check that the right bulbs are in the sockets. bulbs come in two styles. one has 2 contact points and is either for 2 filaments (stop and tail) or a earth wire (Plastic light units) and the other is a single contact that earths out through the metal base . If you have the wrong bulb in place the current will short directly across the contacts and the light will not come on and the fuse will blow. Fuses for tail lights will be 5 amp maximun
The stop lamp switch is screwed into the hydraulic pipe line and is located on the chassis frame offside side member, adjacent to the engine rear crossmembember. The switch is operated by pressure or fluid in the break system.
If you keep blowing the brake fuse than you have a short in the system. Unplug the brake switch. Install a new fuse. If it did not blow than the problem is after the brake switch. Next unplug the turn signal switch, then plug the stop light switch back in and press the brake pedal. Did the fuse blow. If not than the wiring is good in between the two switches. With the turn signal switch disconnected use a jumper wire in between the light green wire (power from the brake switch) and the orange with light blue wire (power to the right brake lamp). If the fuse blows than there is a short in the right side brake circuit between the plug in and the rear socket assembly. If the fuse does not blow than jump from the light green wire to the Light green with orange wire (power to the left brake lamp). If the fuse blows than the problem is in the left hand brake wiring circuit.
you obviously have a short to ground on one of the wires to the back (if it was the front the brake shouldn't blow the fuse). the most common problem is usually in a trailer light harness. if you look under the drivers side rear of the truck, down under the tail light there will be a plugin junction. pull this plug-in apart and see if the fuse still blows. if it does then the problem is forward of that connector, if it doesn't then the problem is behind that plugin. be sure to check for "green death" (electrical corrosion) at all joints especially any trailer hook ups.
My nearside main beam isn't working, I have checked the fuses and they are okay and replaced the bulb,the fitting is fine. but it's still not workin all other front nearsides are okay (sidelight and full beam), as are the offside ones
Something is being missed,start with checking the fuse for the brake lights. Then check the brake light switch for power in and out(when depressed).Your ground is intact so no power. If still nothing, remove the lamp in question and test the contacts. good luck. Don't forget to depress brake pedal while probing contacts.