Yea I'm dumb..One question?

[bmwcr89]

So long strong short... I got frustraded because of the problem that I'm having with the car... found out that the alternator is faulty..

Anyways...

So the car was on right... And my gearbox is open, and I accidently pull out the Reverse lighting wiring... and I heard a spark? I turn off the car and turn it back on, check the reverse light and it still works... did I shorted any wiring out or something??? Because my battery has 9.12V in it, and something is shorting it out, and I need a new alternator???

Would pulling something out such as the reverse light wire while the car is on damage anything specially the battery and alternator??

1989 325i

[Mike325]

So you just disconnected the reverse light wire? That should not hurt anything at all.
Do you know what the voltage output on your alt is? Should be at 14-14.5 volts.

[bmwcr89]

Alternator
LOAD OFF: 13.02V
LOAD ON: 12.67V

Battery wasn't 9.12 It's 12.23V

[Mike325]

Alternator
LOAD OFF: 13.02V
LOAD ON: 12.67V

Battery wasn't 9.12 It's 12.23V

Thoes are not good numbers. Your alt is going and should be replaced. Your battery is low because the alt is not producing the voltage. Check your alt belt first to make sure it is not loose.

[bmwcr89]

Thoes are not good numbers. Your alt is going and should be replaced. Your battery is low because the alt is not producing the voltage. Check your alt belt first to make sure it is not loose.

Thanks Man!!! I will be off tomorrow to replace it... The shop that I went to wanted to charge me $689.12???

[bmwcr89]

Wait... How do I check the belt if it is loose or not?

[Mike325]

Pull on it with the engine off and it should only move a little bit, no more than an inch up or down. Changing the alt is not hard and you should do it yourself. Just make sure you disconnect the battery first.