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

Tiny
TEMPESTCAR
  • MEMBER
  • 1994 MITSUBISHI EXPO
  • 15,022 MILES
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
Monday, November 7th, 2011 AT 2:55 AM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the alternator load tested and double check all connections/wiring on the alternator and battery
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Monday, November 7th, 2011 AT 3:15 AM
Tiny
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
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Monday, November 7th, 2011 AT 3:30 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Okay check the availble voltage at the battery with a voltmeter while engine is running and tell me what's the voltage
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Monday, November 7th, 2011 AT 3:33 AM
Tiny
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
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Monday, November 7th, 2011 AT 3:42 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Your alternator is not reconditioning the battery -double check wiring
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Monday, November 7th, 2011 AT 3:50 AM
Tiny
TEMPESTCAR
  • MEMBER
  • 4 POSTS
Ok I will thank you.
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Monday, November 7th, 2011 AT 4:06 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 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.
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Monday, November 7th, 2011 AT 7:42 AM

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