Hi everyone, I drive a 1991 5.0 LX. Yesterday I went to start my car, and the battery was dead. I had it jumped and the battery gauge read low all the way home. I went and bought a brand new battery afterwards, and everything was ok the rest of the day. This morning I went to start my car and the new battery was dead again. The gauge was still reading low after I put the new battery in. I need to know whats causing this, I need my car to get to school. Thanks for the help.
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1997 SVT Cobra Convertible, bone stock-for a little while at least.
If you live near a Sears or an Autozone, you can have the alternator tested inside the car, but a bench test (as GhostDog suggested) is a better test if you have the time to take it out. It could also be a drain.
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Cardinal Red '88 GT 5 speed, Cobra Upper/Lower, Dynomax complete Super-Turbo cat-back system, Turbo Coupe Rear 10" discs, 3:73 gears, SN95 Master Cylinder, Summit Racing adjustable proportioning valve, Spec Stage II kevlar clutch, steeda adjustable cable/quadrant, 73mm front calipers, P.A. Performance 130 amp alternator, 99 Contour Electric Dual Fans, Battery relocated, rebuilt 91 T-5, Mass Air conversion
simple way to test it: jump your car and let it run for a while. shut it down and UNPLUG the alternator till the next day. plug it back in and then start the car. if it starts, your alternator is bum.
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1965 Mustang Coupe Project: 1965 Mustang Inline 6 (For Now) Coupe, New Floors, New Quarters | Ford 9 Inch Rear, 11" Rear Disc Brakes, 3.50:1 Gears | Control Freak Front U/L Control Arms, Global West Adj. Strut Rods | KYB Gas-A-Justs, Grab-A-Trak 620 Coils & Mid-Eye 5-Leafs | Global West Tubular Subframe Connectors | Addco 1-1/8 Front Swaybar Kit
my battery kept going dead on me too. i thought something was shorting out on the car. but the lights in the visors kept coming on and i didnt realize it until one night i was cleaning my car. this has happened on 2 of my foxbodies. good luck
Battery being drained? 
