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
Re: I have a 1988 bmw 735I it was sitting for about a...
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.
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Before you make any other moves, I would try having the transmission flushed and refilled and filters changed and if that doesn't work, you may have burned out the modulator so you may have to shop around for another transmission or have that one rebuilt, whichever would be feasibly financial for you.
When you turn the key to start, you should have 12 volts at the small terminal on the starter solenoid.
If you have 12 volts but no cranking the solenoid is not working. If you do not have any voltage on this terminal there is a problem in the ignition key wiring. If you have no way to measure the voltage, your best bet is to remove the starter and solenoid, take it to an Auto Zone type store and have them check it for you. When you go to remove the starter, be sure to disconnect the ground lead on your battery first.
Hope this helps. Good luck Loringh PS Please leave a rating for me if appropriate. Thanks