Question about 1988 BMW 7 Series

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I have a 1988 bmw 735I it was sitting for about a month and had b

Been running fine, then I started driving my other vehicle. It started and then I let it run for a while. I turned it off and it would not start it would crank and make a clunk noise and stop then the battery went dead can you helpme figure this out

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Sounds like you left it too long without starting in the first place.
It's possible that you had just enough juice in the battery for the one start. Even leaving it run for a while might not put enough of a charge back to start again.
If it was a very cold night or several cold days then most of the battery could have discharged. Release the battery terminals & put some vasiline or petrolium jelly on the contacts then re-attach the terminals. This should help prevent further discharging.
Either the battery is old & in need of reconditioning or replacement or you may have a leak somewhere. Sometimes alarms can draw a lot of power from a battery if left too long.
Try another battery or see will it start no problem with a pair of jump leads attached to a car or truck.
This should tell you very quickly.

Posted on Dec 19, 2008

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