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Battery draining


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Mad Scientists 
Silver - Posts: 380
Silver spacespace
Joined: February 07, 2004
Location: United States
Posted: September 21, 2006 at 12:46 PM / IP Logged  

"Warning: Never disconnect a battery cable while the engine is running to "test" the alternator. Doing so can cause high voltage spikes that can damage the alternator as well as other electronics."

http://www.aa1car.com/library/2003/us20310.htm

Here's a more in-depth discussion of Toyota charging systems..

http://www.autoshop101.com/forms/h8.pdf#search=%22disconnecting%20battery%20to%20check%20alternator%22

**never** disconnect the battery while the engine is running.. it won't kill an electronics module every time, but how often do you need to buy one to realize it's not a good idea, and not recommended by any vehicle manufacturer?

"To do a proper Current Draw Test, the DMM goes between the Neg(-) Battery Terminal and the Neg(-) Clamp, not the Pos(+) Terminal & Clamp. Leave the Pos(+) connections alone. Performing the test at the Pos(+) Battery Terminal will show an amperage draw, but you may not find the problem. Always go to the Neg(-) Terminal"

Why not?.. aside from the negative terminal being safer (on a negative ground car) what difference will you see using the positive side vs. negative side? I'd think it'd be a violation of Kirchoff's Current Law?

Jim

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