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Altanator good battery good but battery stll dies

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There are 3 most common reasons for the battery to drain.
You have to check these one by one.
A bad chargin system. Start the engine and with a multimetr set at 20V DC, measure voltage between terminal (+) at the battery, and a good ground. The reading should be 13.8 V to 14.2 V. If this is O.K then you have to check the battery.
If the voltage is 12.6Volts than the battery is fully charged. If is 12.45Volts the battery is 75% charged and so on. A bad battery is not able to hold the charge anymore, and need to be replaced with a new one.
The third reason is a phantom voltage leak.
This is a parasitc electrical drain on the battery, because a relay is sticking, a module is not shutting down, or there is a shorted diode in the alternator. To check this you need a bulb 12V 1 Amp, connected with two wires and two aligator clips. Disconect the harness from the positive terminal of the battery, and connect the bulb in serial, with positive terminal of the battery, and with positive harness of the car. Make sure to create solid contacts with aligator clips. The car electrical system hates sparks, which you have to avoid. As soon as you connect the bulb, the system might sink up to one Amper of electricity. This happen because the modules and computer starts learning, but soon the courent will decrease in milliamps. If not then you have parasitic electrical drain on the battery.

Posted on Oct 15, 2010

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Sounds like a starter wire

Posted on Oct 15, 2010

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