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Old 06-16-2014, 08:56 PM   #11
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Originally Posted by Timex View Post
What causes a fuse to blow?
a fuses job is to protect a circuit from a direct short to ground. it is the weak link in the system. a circuit breaker is very similar also with slightly different operation but in the end provides the same function.

let's make a simple light circuit. power must flow from the positive terminal of the battery through the lightbulb and then to the ground, the ground can be the trailer frame or a wire leading back to the negative battery terminal. a fuses is put in between the positive terminal and the load which in this case is a light bulb. a fuse needs to be placed as close to the battery connection as possible for proper protection. if you did not have a fuse and the positive wire were to touch ground it would arch in turn causing a dead short which can cause damage and possible explode the battery. basicly is is welding metal in a simple answer.

The fuse can blow from a direct short to ground, the fuse being lose in the holder causing heat in turn melting the fuse, the motor being shorted or bad, or a bad connection causing high resistance.

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Old 06-16-2014, 09:23 PM   #12
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I had a brake light wire going to the plug receptacle on my truck rub the casing off the wire, touched the frame somewhere and caused a fuse to blow. Had no brake lights and no trailer brakes. That was a fun trip!

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Old 06-16-2014, 09:26 PM   #13
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I believe the wire size in a circuit is selected to handle the current that the circuit requires. A fuse/circuit breaker is sized (amperage rating) and inserted in the circuit to protect the wire.
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Old 06-16-2014, 09:42 PM   #14
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Best way to fix it is replace the fuse/fuse holder with an automatic resetting circuit breaker of the same amperage.

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