Put new alternator on and it still wont charge

Tiny
ANONYMOUS
  • MEMBER
  • 2003 PONTIAC MONTANA
  • 111,111 MILES
Put new alternator on and it still wont charge. Drains new battery.
Wednesday, December 5th, 2012 AT 9:45 PM

5 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
You need a multi meter so we can trouble shoot the problem. Here is a guide to help with the problem.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

You need to check the wiring

https://www.2carpros.com/articles/how-to-check-wiring

Here is the alternator wiring harness (below) make sure you check the alternator fuse.

There is a red wire going to terminal B+ the one with a nut on there should be battery voltage there at the alternator. Also the orange wire to the D terminal at the alternator should have battery voltage. Let me know what you find?

Check out the diagrams (Below)

Please run this test and get back to us.

Cheers

Was this
answer
helpful?
Yes
No
+1
Thursday, December 6th, 2012 AT 1:42 AM
Tiny
CONTINENTALS
  • MEMBER
  • 3 POSTS
Now have multimeter
Was this
answer
helpful?
Yes
No
Saturday, December 8th, 2012 AT 2:28 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Lets start with the engine idling what is the voltage reading at the battery?
Was this
answer
helpful?
Yes
No
+1
Sunday, December 9th, 2012 AT 1:44 AM
Tiny
CONTINENTALS
  • MEMBER
  • 3 POSTS
11.90 so I checked the wiring like you said and found the wire had pulled out the the connector once I fixed it the alternator is changing ya! I love this site.
Was this
answer
helpful?
Yes
No
Sunday, December 9th, 2012 AT 1:40 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken
Was this
answer
helpful?
Yes
No
Sunday, December 9th, 2012 AT 5:47 PM

Please login or register to post a reply.

Sponsored links