Car Fuses and Wiring
Chevy Blazer S-10
Ford Expedition XLT

What causes the courtesy fuse to blow?


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Answered 2006-08-07 14:43:54

Short in the courtesy light receptacle, wiring, or the switch. Can also be a corroded receptacle.


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There must be a short in the system somewhere that causes the fuse to blow.

This is the starter fuse I am talking about. It doesn't blow every time. It might go weeks before it blows again.

a short in the wiring system A blown fuse is caused by a short or an over current condition.

to many plugs in at once or old circuits ECT.

where in the left fuse box ,interior courtesy lights, amp-color

What Causes Any Fuse to "Blow?"The cause is what fuses were invented and are used for:to detect and protect against SHORT CIRCUIT conditions, and /or CIRCUIT OVERLOAD conditions.

It could be your fuel pump fuse or just your fuel pump. i had the same problem it was just the fuse on mine

One of the gauges or wiring has shorted to ground.

Blow My Fuse was created on 1988-09-19.

A current greater than 5 amps; check for short circuits.

A short to ground. Check wiring/sensor for damage.

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If the fuse is labelled F it is fast-blow or T OR S it is slow-blow, the letter should be on the metal cap on the ends of the fuse.

Check a fuse called "courtesy" or "Interior" or something like that. It depends on the auto manufacturer.

Any piece of machinery that is designed to use a fast blow fuse should only use a fast blow fuse. For safety reasons this could save your life instead of taking it.

Hi, The courtesy lights are really controlled by the Body Control Module (BCM), but there is a main fuse that supplies power for the courtesy light function. I believe it is fuse # 35 in the fuse panel that is located in the passenger side dash panel. I have included a link that has a picture and drawing of that fuse panel (see below). Good Luck, Greg

The time it takes for a fuse to blow, either "fast blow" or "slow blow" is determined by the design of the fuse and is described in a table or graph provided by the manufacturer. In general, the higher the applied overload current, the faster the fuse will blow. Fast blow fuses can open in milliseconds, slow blow fuses can open in several seconds. The fuse used depends entirely on the application and what kind of circuit it is protecting.

Short in the speed control switch or the wiring.

I think it might be for your courtesy lights.

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