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having problems with fuse box, need help plz!

 
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Old 06-03-2010, 02:43 PM
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having problems with fuse box, need help plz!

Hello everyone,
I am just joined the forum and became a member. I bought a '94 Honda prelude Si. I bought it to run around town, and I also am trying to restore it. I am having problems with my fuse box. #8 fuse- back up light keeps burning out with in a few minutes, and then my car will shut off. I am thinking there might be a short in the circuit somewhere, but I am not sure. Just hoping to get some help and advice.

Thanks!
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Old 06-03-2010, 05:54 PM
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Re: having problems with fuse box, need help plz!

If you are putting the same fuse in then it should be good, but if you are putting the same one and it's still burning out then I think there is a short.
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Old 06-05-2010, 02:11 PM
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Re: having problems with fuse box, need help plz!

Welcome to the prelude zone and enjoy the forum, okay and back to your problem if its burning the fuse as soon as you replace it with another the definite you have short , like k 9 said, you need to start at looking into the inside under the dashboard of the car ,some thing is grounding with a power source causing a short , some time wire become brittle with time.Try to trace back any recent electrical updated electronic like a radio amp alarm .ect.
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Old 06-05-2010, 03:34 PM
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Re: having problems with fuse box, need help plz!

There are a couple types of circuit failure, 3 to be exact.

Short
Open
High resistance

You have a short. There are two types of shorts. Short to ground and short to power. The type of short that blows fuses is short to ground. Whats happening is the electricity is coming from the battery, going through the fuse, then grounding. That means its not encountering the required resistance within the circuit to use up the amperage, so its all going through the fuse, which is causing it to blow.

Short to ground is easier to find than short to power. Get a DMM and a wiring diagram for that circuit. Use the DMM on volts to test voltage drop. Up to a certain point the vd should be 12.6v, then nothing. Between those two points is your short. *To do voltage drop place on lead of the DMM on your battery ground post and the other follows the circuit. Test points in the circuit where you can reach, it usually doesn't happen along just wire. Test connection points and such. **Don't poke holes in the wire dammit, I don't care who tells you to do so, you will screw up your wiring. Use a t-pin and backprobe at connectors, or test soldering points to components and such. Never poke holes in wires, ever. EVER.

Anyway chances are part of the wire is bare and rubbing against a metal component, which is causing it to ground.


The above method for finding the short may be wrong. I'm tired and lazy and I have a crappy memory. So someone correct me if I'm wrong. Someone who knows what the hell they're talking about please.
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