Question about 1997 BMW 318

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No charge between alternator and battery on bmw318

Newalternator fitted but still wont

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Check the cable in the alternator ( the most thick) if gave power with the engine off if don't have power connect a cable from alternator to + battery and check if is working.

Posted on Mar 21, 2014


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The car wont charge . i put a new alt another battery still wont charge played with key off and on start charge momentary with key off for few second but soon as turn on real quick it stops any thing u...

same as mine ,4.0lt mine but its for sundays only cannot afford the petrol ,anyway check the wires on the alternator ,one big one and a smaller one ,now start engine and take neg battery terminal off if it stops then alternator isnt charging ,if so fit a genuine bosch factory exchange unit .but first make sure you have power in the thick cable from the battery though ,sometimes they get a dirty connection in the power distribution box ,if in doubt connect a wire from the jump start point on the firewall to the terminal on the alternator

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Hi there i have fitted a new

When you turn on the lights or fan there is a draw on the system causing the alternator to kick in, therefore the higher voltage. Probably without them on and your battery is charged, the current would be less or none and you may just be measuring the battery voltage. If you discharge the battery the charging voltage will probably go up because then it will be in a charging state. So your new alternator is probably OK.
You can test it by driving --if the battery becomes discharged, then the alternator is not working

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check for battery voltage at the charge post on the alternator and at the 2 wire connect with the key on .if you have it then its a bad alternator. if you have a belt spinning the alternator.

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