battery problem after motor swap
01-31-2016, 01:21 AM
Thread Starter
Join Date: Jan 2016
Location: oregon
Posts: 8
battery problem after motor swap
so I swaped ecu pats motor harness out of a 2000 mustang gt into a 2002 mustang gt it runs and drives great but I seem to be having problem with my charging system I used the battery out of my 02 and it fired right up but now it seems like right after I shut off the car the battery dies in a matter of minutes could there be a electrical draw some where or is my battery shot and wont hold a charge I tested to day with multimeter while car was running 12.85 fluxing just put in new alt
01-31-2016, 03:09 AM
is my username.
Join Date: May 2006
Location: Earth
Posts: 13,807
How old is the battery? And do you possibly have the radio on when turning off the car and is there a subwoofer/amp?
01-31-2016, 03:20 AM
Thread Starter
Join Date: Jan 2016
Location: oregon
Posts: 8
stock mach 460 sound system everything seems to be shut off. ive tried two batterys so far. when I turn the key to the on postion the rear defrost light stays on I pulled the fuse and the wiring to window thinking that might be where the draw is and still the same thing happens
01-31-2016, 08:01 PM
Thread Starter
Join Date: Jan 2016
Location: oregon
Posts: 8
just bought a new battery drained in a number of hrs
01-31-2016, 08:38 PM
5th Gear Member
Join Date: Dec 2006
Location: North Carolina
Posts: 2,223
12.8 is low i think, shouldn't it be at least 13 min? I know 99-00 had a different charging system but that could have been just for the v6s.
01-31-2016, 09:58 PM
Thread Starter
Join Date: Jan 2016
Location: oregon
Posts: 8
i just bought a new battery today died in a matter of hrs when sitting im guessing i have something drawing ppower
02-01-2016, 07:57 AM
Foghorn Leghorn
Join Date: Dec 2006
Location: I reside in a near constant state of amazment.
Posts: 2,923
Yeah, I'd say so. Sounds like something BIG is drawing it down.
02-01-2016, 11:31 AM
Thread Starter
Join Date: Jan 2016
Location: oregon
Posts: 8
found that my rear defroster is consistently on is there a fuse to pull for this I pulled the fuse for the defogger switch/ac clutch
02-01-2016, 01:00 PM
Foghorn Leghorn
Join Date: Dec 2006
Location: I reside in a near constant state of amazment.
Posts: 2,923
Those are two 'nice to have' pieces of kit but that shouldn't be too tough to figure out.
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