Infinity G20 battery sporadically discharges

IM1BIGBEAR

MEMBER
1992 INFINITI G20

Every so often the battery discharges. Jump it and its fine for a month or so. Then the cycle starts again. Shampoo rinse repeat. Lol

dont know if the stereo is shorting against something but it seems like when ever something gets moved in the trunk is when it happens.

2 Replies

JACKSPRAT

MEMBER
46 POSTS

Check if the light is staying on it the trunk. Also ensure trunk and all doors are closed properly. You could try removing fuses for the stereo and trunk light while parked overnight and see if this cures it.

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Monday, January 9th, 2012 AT 7:45 PM

CARADIODOC

MECHANIC
33,871 POSTS

If it always takes that long to run the battery down, have the generator load tested with a tester that shows "ripple". If ripple is high and the most output you can get is exactly one third of its rated capacity, there is a defective diode. With one third of normal capacity, that is barely enough to run the fuel pump, ignition system, all of the computer, lights, and other accessories with nothing left over to recharge the battery.

You can also measure the battery voltage while the engine is running. It must be between 13.75 and 14.75 volts. If it is slightly high, the voltage regulator is responding to the drops from the missing phase caused by the bad diode. As you load the system down by turning on the heater fan, head lights, wipers, etc, you'll see the voltage drop to less than 13.0 volts if there's a bad diode.

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Tuesday, January 10th, 2012 AT 2:32 AM