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Alternator Problems?


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#1 keefers

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Posted 12 March 2010 - 02:28 AM

Hi, I have a 98 sportspack, which does not appear to be charging correctly, the ignition light goes off when started but whilst driving the voltmeter appears to drop towards the red, regardless of engine revs, if the car is stationary with engine running, needle goes back to 13v, even stationary with engine revving does not go above this position, with a dvm measured across the battery it does not read more than about 13.4v, have swapped the regulator from my 216, but still the same, am thinking faulty rectifiers but would this not cause battery drain?? any help much appreciated..

#2 mykweb

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Posted 12 March 2010 - 02:16 PM

Hi, I have a 98 sportspack, which does not appear to be charging correctly, the ignition light goes off when started but whilst driving the voltmeter appears to drop towards the red, regardless of engine revs, if the car is stationary with engine running, needle goes back to 13v, even stationary with engine revving does not go above this position, with a dvm measured across the battery it does not read more than about 13.4v, have swapped the regulator from my 216, but still the same, am thinking faulty rectifiers but would this not cause battery drain?? any help much appreciated..



Check the cables that go to alternator and also the connections on the Starter motor. The Mpi is well bad for these point rusting and causing issues.

Done it with my cooper.

Mike

#3 keefers

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Posted 12 March 2010 - 08:05 PM

Hi, I have a 98 sportspack, which does not appear to be charging correctly, the ignition light goes off when started but whilst driving the voltmeter appears to drop towards the red, regardless of engine revs, if the car is stationary with engine running, needle goes back to 13v, even stationary with engine revving does not go above this position, with a dvm measured across the battery it does not read more than about 13.4v, have swapped the regulator from my 216, but still the same, am thinking faulty rectifiers but would this not cause battery drain?? any help much appreciated..



Check the cables that go to alternator and also the connections on the Starter motor. The Mpi is well bad for these point rusting and causing issues.

Done it with my cooper.

Mike




cheers, will give it a try at the weekend.

#4 keefers

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Posted 12 March 2010 - 08:09 PM

Hi, I have a 98 sportspack, which does not appear to be charging correctly, the ignition light goes off when started but whilst driving the voltmeter appears to drop towards the red, regardless of engine revs, if the car is stationary with engine running, needle goes back to 13v, even stationary with engine revving does not go above this position, with a dvm measured across the battery it does not read more than about 13.4v, have swapped the regulator from my 216, but still the same, am thinking faulty rectifiers but would this not cause battery drain?? any help much appreciated..



Check the cables that go to alternator and also the connections on the Starter motor. The Mpi is well bad for these point rusting and causing issues.

Done it with my cooper.

Mike




cheers, will give it a try at the weekend.



#5 keefers

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Posted 12 March 2010 - 08:16 PM

Hi, I have a 98 sportspack, which does not appear to be charging correctly, the ignition light goes off when started but whilst driving the voltmeter appears to drop towards the red, regardless of engine revs, if the car is stationary with engine running, needle goes back to 13v, even stationary with engine revving does not go above this position, with a dvm measured across the battery it does not read more than about 13.4v, have swapped the regulator from my 216, but still the same, am thinking faulty rectifiers but would this not cause battery drain?? any help much appreciated..



have just checked the circuit diags, pinned as mini pdf guides, and they show alternator w/light switch, could anyone enlighten me???

Edited by keefers, 13 March 2010 - 02:20 AM.


#6 keefers

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Posted 13 March 2010 - 06:33 PM

Hi, I have a 98 sportspack, which does not appear to be charging correctly, the ignition light goes off when started but whilst driving the voltmeter appears to drop towards the red, regardless of engine revs, if the car is stationary with engine running, needle goes back to 13v, even stationary with engine revving does not go above this position, with a dvm measured across the battery it does not read more than about 13.4v, have swapped the regulator from my 216, but still the same, am thinking faulty rectifiers but would this not cause battery drain?? any help much appreciated..



have just checked the circuit diags, pinned as mini pdf guides, and they show alternator w/light switch, could anyone enlighten me???



Thanks mkvweb, was indeed poor corroded connection on starter motor, guess movement of engine whilst driving, dislodged broken wire which re-made when stationery.Attached File  elec_connection.jpg   243.52K   22 downloads

#7 mykweb

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Posted 14 March 2010 - 02:06 PM

Common problem, that my car has suffered from. Its a proper PITA.

Make sure you grease up the nut on the starter motor, this will prevent it rusting as quikc in the future.

MIke




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