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battery drain, how to check?


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Ohmz 
Copper - Posts: 193
Copper spacespace
Joined: May 09, 2002
Location: United States
Posted: December 19, 2002 at 8:42 AM / IP Logged  

Hey guys! I have a simple question. I have a customer that says his battery is running low. I can't recall the reading  I'm suppose to get on my DMM when there is nothing in the vehicle that is making the battery to run low.  Can someone remind me! Thanks!

My Personal Installer Note: Connectors are easy, neat, and professional. But do you know how to crimp properly?
Velocity Motors 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: December 19, 2002 at 9:03 AM / IP Logged  
  • A healthy battery is about 12.2 - 12.8 volts
  • A not so good battery ( but still operational ) is about 11.4 - 12 volts
  • A battery needing replacement will read under 11 volts ( about 10.5 - 10.8 )

I hope this is what you were wanting.

Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
DanDan 
Copper - Posts: 125
Copper spacespace
Joined: September 25, 2002
Location: United States
Posted: December 19, 2002 at 8:00 PM / IP Logged  

Anything over a 25ma draw is considered parasitic.  Use your DC ma current setting on your dmm.  Put it in line with your battery to check to see if the battery has a parasitic draw.

Dan

Ohmz 
Copper - Posts: 193
Copper spacespace
Joined: May 09, 2002
Location: United States
Posted: December 20, 2002 at 12:16 PM / IP Logged  
Thanks Jeff / Dan. This should be helpful enough. I will check over the weekend. I'm pretty sure there is something drawing from the battery because the vehicle was in a  recent accident and was ok before.

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