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Alternator, Battery, Ground????

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cracra
Posts: 12
Joined: Sat Apr 28, 2018 6:45 pm
Year and Model: 1991
Location: Portland, Oregon
United States of America

Alternator, Battery, Ground????

Post by cracra » Tue Jul 10, 2018 9:56 pm

Hello to everyone out there. So I am a woman trying to figure out why my new alternator is not charging my battery. I have taken off the wire that connects to the back of the alternator and first I'd like to know what this wire is? Next I am wondering if the copper wiring that is suppose to be out of the casing? I hope I phrased that right. Please anyone help. Have a job interview in the morning and I need to try and figure this out.

Thank you



RickHaleParker
Posts: 1139
Joined: Mon May 25, 2015 2:30 pm
Year and Model: 1998 C70 Coupe
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Re: Alternator, Battery, Ground????

Post by RickHaleParker » Wed Jul 11, 2018 4:29 pm

Year, model and engine?


1997 S90, B6304S, AW30-42
1998 C70, B5234T3, AW50-42

cracra
Posts: 12
Joined: Sat Apr 28, 2018 6:45 pm
Year and Model: 1991
Location: Portland, Oregon
United States of America

Re: Alternator, Battery, Ground????

Post by cracra » Thu Jul 12, 2018 1:39 am

1991 Volvo 940 turbo. okay please forgive me cause I don't know the exact name of these parts, i'll do my best to describe them though lol. So, I noticed there is a big wire that connects to the starter but then it goes to something else too, and i noticed that about an inch or more of the copper wire is unprotected from the red casing. And so I'm wondering if that could be shorting it out?

Thank you Rick, I appreciate your response. as I said I am a woman trying to fix this myself...



RickHaleParker
Posts: 1139
Joined: Mon May 25, 2015 2:30 pm
Year and Model: 1998 C70 Coupe
Location: Kansas
Has thanked: 2 times
Been thanked: 95 times
United States of America

Re: Alternator, Battery, Ground????

Post by RickHaleParker » Thu Jul 12, 2018 3:34 am

It sounds like you are looking at the battery cable, big and runs to the positive (+) side of the battery and the starter. The insulation (Red casing) is there to keep it from shorting. If the battery cable shorts out, the alternator will not charge the battery and it can burn out your alternator. A quick fix is to wrap the damaged insulation part with damaged insulation with about three layers of black electrical tape.

The long term fix is to replace any damaged cables or wires.

If it has been shorting out, there is a good chance the Battery cable is internally damaged also the wire to the alternator could be internally damaged, which would keep a good alternator from charging the battery.

The bigger wire on the back of the alternator carries the charging current from the alternator to the battery. If it is open, shorted or damaged there is none or insufficient charging current flowing to the battery.

Being a woman is is irrelevant, my sister can out diagnose a lot of guys when it comes to automotive repair, and don't forget mathematics and computer code done by women, put a man on the moon.


1997 S90, B6304S, AW30-42
1998 C70, B5234T3, AW50-42

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