Question about 1997 Pontiac Bonneville

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1997 Pontiac Bonneville runs fine for hours, but then charge dies

Ok. Just bought a 1997 Bonneville with 200k miles 2 weeks ago. It has a wierd problem. If I run the car for about an hour, then the battery charge indicator will start to fluxuate at what seems to be 2-5 minute intervals. If i run any electrical component(A/C, radio,lights, power windows, etc...) you can watch the indicator go down, all the way to 0 and it will stall the car out.

I have replaced the ignition coils, plugs, plug wires, alternator, and battery.

The obd read 18070(Transmission Component Slip), but I somehow dont think thats what is causing me to lose charge. Can anyone help? Thanks.

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  • dacheeba Jul 15, 2009

    There is a battery on the transmission?

  • dacheeba Jul 15, 2009

    There is a battery on the transmission?

  • dacheeba Jul 15, 2009

    Battery is fully charged. Check the wires and ground, they are good. If it was just the gauge, it wouldn't die when it hit 0, would it?

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It sounds like your alternator belt is loose. It will expand as it gets warm from running the engine. That will allow the battery to drain. Tighten or replace the belt.

Posted on Jul 15, 2009

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Make sure the battery is good and fully charged . You will get the code if the battery is bad on the transmission.Check the ground wire from the engine to the frame of car. Must have a good one. Check to see if the battery cable is getting hot. The gauge inside the car could also be bad. A few things you should look at

Posted on Jul 15, 2009

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