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My 20a fuse keeps blowing even after I disconnected the wiper motor

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If the fuse is blowing, there is either a dead short to ground.
Or there is more on the circuit than just the wiper motor.

Posted on Apr 14, 2015

  • montehammons Apr 14, 2015

    There is often the windshield washer fluid pump on the same fuse as the wipers, part of the wiper circuit. I don't know if that tiny little motor would blow the fuse, but it's some more wiring to check. Mike, you really need a wiring diagram of the circuit.

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My wiper fuse keeps burning out


If your wiper fuse keeps burning out, your wiper motor might be failing which causes too much amperes required to turn the motor which in turn trips the maximum rated amperes of the fuse.

Follow the wiring of that fuse to your wiper motor to make sure the wiring is not nicked and grounding to the metal. Once you confirm that there is no shorted wire, disconnect the wiper motors wiring connector. Fuse a new fuse and if the fuse does not blow anymore then you isolated the problem which is the wiper motor causing the fuse to blow. Fix or replace the wiper motor.

When diagnosing blown fuses, I usually temporarily replace any fuse in a vehicle with a circuit breaker type fuse. If there is still a short somewhere in the wiring or the component itself in line with the fuse, the circuit breaker fuse will just trip and I just reset it again after I fix the problem. An advantage of keeping to replace a blown fuse while diagnosing.

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The fuse for my wipers keep blowing. Tested the windshield wiper motor and still blows. Frustrated and don't know what to do next.


Try disconnecting the wiper motor, then either put in a fuse to see if it blows, or use a tester to see if there is a short on the wiper motor side of the wiring. Isolate the problem, and you will find it.

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1 Answer

Fuse blown WINDSHIELD WIPER


its shorted some where from the fuse to the motor
for sure. the fuse saved the fire.
disconnect the wiper motor and fuse.
and use an ohmmeter to find this short.
0 ohms is short. infinity is good, per above setup./
if not obvious the cause, the wire can be bypassed or unwrapped (hard)

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Since you Disconnect the motor also renewed the switch and is still blowing the fuse ,it is obvious that you have either broken wire between the switch and the motor. Try to test the failure by means of a tester circuit. Good Luck.

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The power distribution box in the engine compartment # 6 , 30 amp mini - fuse , front wiper motor , front wiper relay , front washer pump , FEM ( also # 7 , 25 amp mini - fuse , rear wiper etc. ) The owners manual shows to disconnect your battery cables before servicing anything in the PD BOX

your relay could be shorted which makes the fuse keep blowing

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Do not put a larger amperage fuse in. you run the risk of the wiring over heating and starting an electrical fire. More than likely the wiper motor is starting to go bad and is drawing an unusually large amount of current which causes the fuse to blow. Replace the wiper motor.

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1 Answer

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Try removing the harness connector to the motor, and see if it still blows the fuse, then you've isolated the problem.

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