I Have a BMW525TD 1995 have replaced the alternator and replaced battery both are new starts goes no probs charges battery no probs but is dischargeing battery over night when left with no keys or anything on , have discovered that the fuel pump is running without the keys in the ignition so thinking this might be the problem took the fuse out but alas still runs battery down am at a loss as to what might be the problem at present i disconnect the battery when am not useing the car
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get a12 volt test light (autozone or any part store) . disconnect negative battery. connect light between negative terrminal of batteryand negitive cable if light lights something is useing battery power remove bulbs lighting hood and trunk until test light does not light disconect anything electrical until the test light goes out. if you disconnect alternater and it goes out replace alternator. if this was helpful please leave good feed back
are the alternator and battery new or second hand,im gonna assume second hand just based on price etc,the battery can b checked to see if its holding a charge independently of the alternator,vice versa the alternator can be checked to see if it is providing a charge,so common donominator is the belt,is is tight enough and check the earth strap at battery for rust or greenish powder if so wire brush and clean,it cant b a big prob
have you checked the battery? when they get too low, alternators will not always charge them. if you start the car, and disconnect the positive battery cable, the car should continue to idle.. if not, u need a new alternator.
it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.
if you can charge the battery and drive it for a while then sounds like the altenator has failed and is not re-charging the battery, good way to test is to charge the battery, start the car and turn the light on, if everything is dimm or the motor dies there is little to no charge voltage, and will require altenator work
First tell your husband to by a test light! They last for ever! LOL
The prob is most likely the alternator. Remove the negative battery cable, then the power cable at the alternator. With his 'new' test light, check for power between the negative battery post and the cable removed from the alternator. If the light comes on, the alternator has a diode prob. If you want you can also take it for a drive, then remove the battery cable, let everything cool over night, reconnect the cable, wait for about half an hour, feel the alternator for warmth. Frankster016