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Jerry
Jerry, Master Mechanic
Category: Audi
Satisfied Customers: 16998
Experience:  ASE Master, 30+ years exp. imports and domestic, former shop owner
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Have a short circuit and drain the battery fast, what I can

Customer Question

Have a short circuit and drain the battery fast, what I can do to locate the short
JA: Have you tested the battery with a voltmeter? And can you see if it's leaking or not?
Customer: Is a brand new battery
JA: What is the model/year of your Audi?
Customer: 1999 A4 quattro 2.8L
JA: Are you fixing your A4 quattro yourself? What have you tried so far?
Customer: nothing sofar
JA: Anything else you want the mechanic to know before I connect you?
Customer: well the module for the ABS need to be fix
Submitted: 2 months ago.
Category: Audi
Expert:  Jerry replied 2 months ago.

Hello and welcome. My name is ***** ***** you for visiting the site, I am reviewing your question and will reply shortly, thanks.

Expert:  Jerry replied 2 months ago.

Let me start by saying that any money that you paid, or if you have a subscription, that money stays in your account until the answers are rated, (positive) regardless of how fast or how long it may take to get finished. You can FOLLOW UP AT ANYTIME, even after rating.

As long as the alternator is charging the battery when the engine is running. You will want to check for a current draw. Normally that is done by disconnecting the negative battery cable and hooking up an amp meter in series with the circuit.

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Also can be done with a 12 volt test light. You just go from the battery terminal to the cable end, (disconnected) and see what the draw is or if the light comes on.

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The recommendation for maximum parasitic drain is around 30 mA (0.030 amp). A typical drain today actually falls into the 7-12 mA range, even though some vehicles do approach the maximum. Multiply the drain (in amps) by the time (in hours) the battery sits without being recharged. The result is the amount of AH consumed by the parasitic drain. The actual drain may be small, but over time the battery grows steadily weaker.

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If so, then you will want to start pulling fuses one at a time until the light goes out, (or meter goes down) and that will be the circuit in which the draw is in. If no fuses being pulled cause it to drop, then unplug the alternator then the starter. They could do it but it's rare.

Just remember to keep the doors closed, (or dome light disabled) and the hood light unplugged,

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Please don’t forget to rate the answer, **** THAT IS THE ONLY WAY I GET PAID **** if you need any more on it, I will be here.

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Thanks

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