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How do you find a Automotive short circuit?

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βˆ™ 2007-06-28 05:04:40

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When most people say "short," they are talking about a parasitic load, a circuit that is always on and drains the battery. Take the negative cable of the battery post, take your test light (ice pick type) and connect betw battery post and negative connector. Make sure everything in the car is off (dome light, amplifier, for example). If you have a current drain at this point the light will be on. Pull fuses one at a time and watch to see which one turns out the light. That will be the circuit your parasitic load is on. Get a wiring diagram and check the wires/switches/components on that circuit. For a real short, which blows fuses as fast as you can change them, you need a special circuit breaker that fits in the fuse panel in place of the fuse. This will power the circuit enough to work with it, but prevent meltdown. Now that you have current flow, you can run a small compass over where the wires for that circuit are running and watch for the needle to switch directions. Ask at the parts store, I don't recall what they call this ciruit breaker.

2007-06-28 05:04:40
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Related Questions

Can you use a gauss gauge or a tone generator to find a short circuit?

Yes you can use both. They are also acutally the easiest way to find a short in an automotive circuit.

What is the importance of short circuit and open-circuit test?

in short circuit test you can find copper losses and open circuit test you can find iron losses

When open circuit and a short circuits are useful?

open circuit test is mainly used to find CORE LOSSES short circuit test is mainly used to find COPPER LOSSES

How do you use a voltage meter to find a short circuit?

You don't. What you can use is the resistance scale on a VOM. If the circuit has a reading of zero ohms to ground then it is very likely that the circuit under test has gone to ground. This grounding of the circuit is what caused the short circuit. Find the short circuit before re-fusing or turning the breaker back on.

What can you use to find a short-circuit?

A short circuit would blow a fuse. Most fuses are marked as to which circuit they protect. Now that you know which circuit is shorted you can examine the suspected circuit for problems like damaged/pinched wiring to ground.

What causes a short circuit?

-circuit damage -overheating -fire or explosion causes a short circuit.

When is short circuit happens?

A short circuit happens when there is no resistance in the circuit.

When you will get to know that short circuit will happen?

1. That if a short circuit occurs we will get a sign before short circuit will happen or not ? 2. what we can do ? 3. how fuse can get a short circuit ? 4. which wires we have to use from preventing short circuit ?

What you find from short circuit of power transformer?

A: Usually smoke and smell

What happens in a short circuit occurs in an electric circuit?

When a short circuit occurs the circuit overheats. Short circuits often result in home fires.

How do you reset a automotive circuit breaker?

Most automotive circuit breakers reset themselves after they cool off. Some bigger trucks use circuit breakers that are reset manually. They have a button you push in to reset the breaker after it has cooled off.

What is the reason to use open circuit and short circuit methods to find Transformer losses?

The transformer can be tested on open and short circuit to find the iron losses and copper losses separately, which uses a fraction of the power than having to run the transformer on full-load.

What do you do if the fuses keep blowing?

Find out why the fuse is blowing. You have a short or the circuit is overloaded.

What are approximations of open circuit and short circuit tests?

open circuit has infinite resistance short circuit has no resistance at all

Is a megohm a short circuit?

No. A short circuit would be zero ohms.

Why does the horn blow when you brake and turn?

The problem here sounds like a short-to-voltage between the horn circuit and the brake or other circuits. This essentially means that when one circuit is powered on, such as your brake light circuit when you depress the brake pedal, an additional circuit is also powered on by that circuit due to the copper wiring from the two circuits touching one another. If you are familiar with a DMM (digital multimeter) you can diagnose your wiring to find the source of the problem. Otherwise, you might be taking the vehicle to a shop to have it diagnosed/repaired. I would recommend an automotive technician that is ASE certified specifically in automotive electronics, not just any regular "mechanic."

How does a short circuit work?

A short circuit is an interruption in the design of a circuit. The short interferes with the flow of electricity causing feedback through the process.

Every short circuit is always a closed circuit while every closed circuit is not a short circuit?

Long winded but true.

What is a circuit with no load?

An open circuit or a short-circuit (if that circuit is complete).

Will short circuit wasting energy?

Short circuit blowing fuse or breaker.

When can be short circuit can be dangerous?

Short Circuit can be dangerous do to the fact that they can start fires.

Short circuit example?

An example of a kind of short circuit is an arc welding.

Why is your engine control fuse keep blowing?

There is an overload or short to ground in the circuit.There is an overload or short to ground in the circuit.

Reverse light fuse keeps blowing out?

Short to ground or overload in the circuit.Short to ground or overload in the circuit.

BMW 325e electric window circuit breaker reset?

Resetting Automotive Circuit BreakersWithout doing a "hands on" troubleshooting of your vehicle no one on this site can tell you specifically, what is causing the problem, or where to find it. It has been my experience that all of the circuit breakers for automotive applications are self resetting.Inside, they use bimetallic strips, and reset themselves when the circuit current overload, or short circuitconditions, has been removed/eliminated, and the bimetallic strip has cooled down.IF your breaker is not resetting itself after a reasonable "cool down" period, then that suggests:A short circuit condition somewhere in that circuit, orAn overload condition due to the addition of too much "extra" electrical equipment [like for example, a "monster" audio amplifier, or a light bar set], orReplacement of an electrical device with one which uses much more current than the replaced device, orA defective circuit breaker.