Is it my alternator?

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04-23-13, 11:40 AM

#16

LScowboyLS

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Quote:

Originally Posted by YoshiMan

DON'T DO THIS. It is a TERRIBLE idea to disconnect the battery with the engine running!! You can fry all sorts of very expensive electronics, especially on a power option laden car like the LS400.

Exactly!

PS - the reason is that the battery acts as a giant protective capacitor, and I am with YoshiMan, never do this, wayyy too risky! - This was a fine idea on your 1972 Ford F-100 pickup but not on the LS

Last edited by LScowboyLS; 04-23-13 at 07:38 PM.

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04-23-13, 12:27 PM

#17

LS400BOY

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Ok got ya im glade i havent done it yet

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04-23-13, 01:52 PM

#18

j2b4o

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Is there a reason no one has suggested testing voltage with a volt meter?
Check voltage with car off and than running and than with lights and fan on and than test in reverse order. The behavior of the voltage will tell you everything you need to know.

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04-23-13, 06:38 PM

#19

LScowboyLS

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Quote:

Originally Posted by j2b4o

correct. (assuming the alternator connections, ground, and associated fuses & fuselinks are good)

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04-23-13, 06:44 PM

#20

usoff89

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Quote:

Originally Posted by YoshiMan

DON'T DO THIS. It is a TERRIBLE idea to disconnect the battery with the engine running!! You can fry all sorts of very expensive electronics, especially on a power option laden car like the LS400.

I agree! Do not disconnect the batt with the car running. You can send a surge of power to the ECU and fry it or other parts. You can get away with doinig this on an older carb'd car/truck, but I would not suggest it on something like the LS.