i have a battery drain and need to know how to find it ?

1994 MITSUBISHI EXPO
15,022 MILES
Avatar
TEMPESTCAR
  • MEMBER
  • 4 POSTS
i drve the car and it will drain my battery,i changed the altornator new battery cables new battery and it still drain it to much to start and keep running for more than 20 minutes
Nov 6, 2011 at 6:55 PM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Have the alternator load tested and double check all connections/wiring on the alternator and battery
Nov 6, 2011 at 7:15 PM
Avatar
TEMPESTCAR
  • MEMBER
  • 4 POSTS
the altornator was changed twice and the cables are new too i just changed them on wensday . and it still has this problem and it is drive me nuts
Nov 6, 2011 at 7:30 PM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Okay check the availble voltage at the battery with a voltmeter while engine is running and tell me what's the voltage
Nov 6, 2011 at 7:33 PM
Avatar
TEMPESTCAR
  • MEMBER
  • 4 POSTS
i did that and it shows 12.85 on the voltmeter and when the car is off it is 12.40
Nov 6, 2011 at 7:42 PM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Your alternator is not reconditioning the battery -double check wiring
Nov 6, 2011 at 7:50 PM
Avatar
TEMPESTCAR
  • MEMBER
  • 4 POSTS
ok i will thank you.
Nov 6, 2011 at 8:06 PM
Avatar
KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Check the crank pulley for a bad harmonic damper. If the pulley is bad, the alternator would not be able to provide the required charge as it is turning below the required speed.
Nov 6, 2011 at 11:42 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle