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Hey guys I have a problem with my mustang.....again.Heres what happens ,I changed the alternator,starter solenoid,external regulator( 83 mustangs come with an external voltage regulator),starter,Cheap battery and battery cables because when I first got it it had a short I couldnt find, but my mechanic fixed it.Now when I jump start my car it starts up and runs great I can shut it off then start it up about 2 hours later with no problems but when the car sits overnight the battery is almost dead ,at about 10v's by morning this has happened once in a while only when its really cold out overnight and ever since I changed to the 87 and up style front end after rewiring the headlights.The car has also been sitting for about 4 months without starting while I waited to finish the bodywork and exhaust mods.I took the negative cable off and hooked a test light in between the cable and the negative battery post and it didnt light at all.I also did the test by unplugging the fuses and hooking a test light between the connectors and it did not light on anything including the circut breakers on the fuse panel and the blinker circuit.I just ordered a optima yellow top battery ,do you think it could be a short in the battery? any other help would be greatly appreciated!!!
 

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the radio and clock( If it has one) are hot all the time. maybe its in that wiring? Sounds like you have some sort of elec. draw. Unhook the+ bat. cable..Get a piece of 8 or 10 gague wire and hook up a ampmeter between the + post and the + cable after you shut it down...any draw should show as current movement on the meter....this is for test only....
 

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Either the alt isn't charging well, you have a draw, or you killed your battery from the last time you had problems. Batteries don't take well to being completely discharged. Once you get your battery, take the car to a parts store that can hook up your car and read alternator output. If that's good, then start searching for draws. Good luck.

Billy
 
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