if i disconnect battery at night -should i disconnect pos or neg post? or does it matter?

Asked by Apr 21, 2016 at 07:56 AM about the 2000 Ford Mustang Base

Question type: Maintenance & Repair

car does not start after sitting 1-2 days without a jump---battery good posts
good  -- maybe starter ou alternator?

1 Answer

90,535

Negative cable is right. But everytime you do,this it resets the computer back to factory, so your loosing fuel mileage and performance until the computer relearns the system all over again. Something you can do fairly easy is but a test light between the battery post and the terminal end on the cable if the light turns on bright then you have a draw big enough to kill a battery quickly, now just electrical disconnect the alternator, if the light goes out or drops to just a faint glow you have found you culprit, replace the alternator. HTH

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