Question about 2000 Ford Mustang

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After sitting for 30 minutes or more the battery is discharged enough it will not start the car. GEM was replaced and still does the same thing. It is a 2000 Mustang V-6.

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Hello, I understand what you saying to be the Battery runs down in 30 minutes and is too weak to then turn the starter? Have you had a load test done on the Battery? It sounds like you need a Draw test done on the Starter too, but if you can get a loaner tool at Autozone or Oreillys, or Advance you can test the Starter on the car.

The new GEM may get you into more problems than it solves. Everywhere I read, the GEM requires reprogramming at a Dealer or with a scanner. If the GEM did not stop the Battery drain put the old one back on.

On your trip to the autoparts store you might want to bring the Alternator along with your Battery. A bad Diode will discharge a Battery, ask them to check the Alternator. The rear window Defoster uses massive amounts of power and the switches can fail and leave the rear Defroster on 24/7. Touch the outside of the glass and see if its hot when the Battery is connected. You should not be getting much spark when you connect the battery cables.

If the engine spun over but did not hit, you have a simple resettable switch in the rear left side of your trunk. It is called an Inertia switch and can be under a plastic plug cover under the carpet. You just press a button and the fuel pump will work again.

You should be looking for shorts in the system. I have listed 3. The Alternator Diode, the Starter, and the rear Window defroster. If the car now cranks good, the Inertia switch is reset and still does not start, try a TPS switch.

Posted on Mar 12, 2011

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It sounds like you have a bad connection. Clean all connections: at the battery, alternator connections, solenoid connections, connections at the starter, and the ground on the engine block.

Posted on Mar 12, 2011

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