North American Turbocoupe Organization



Battery being drained
Go Roush Offline
Junior Member
#1
Help me dont know whats causing it.. My battery is being drained if the car sits for more than 12hrs. Ive checked the obvoius with stereo stuff and lights but I just dont know. Any help would be greatly appreciated.
03 Ford F150 Supercrew
07 Suzuki Boulevard C50T
1983 Turbocoupe
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deadbird Offline
Posting Freak
#2
Have you done anything to the car recently? Do you have a multi meter? Live by a harbor freight?
1987 5 sp.
- 4.6 2v swap.
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Scott Mabe Offline
Member
#3
You could try using a multi meter that will read amps, with ignition off take one fuse out at a time and put the leads where the fuse was. Several circuits will have some draw, the one with the highest draw should be what's draining your battery.
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
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Pete D Offline
Administrator
#4
Have yoiu checked the rear seat reading lights. They can get turned on and never noticed. Switch is on the very back of the console.
Pete Dunham


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boosted chicken Offline
Senior Member
#5
Scott Mabe Wrote:You could try using a multi meter that will read amps, with ignition off take one fuse out at a time and put the leads where the fuse was. Several circuits will have some draw, the one with the highest draw should be what's draining your battery.
You can do this with a test light as well. Anything more than a very dim light indicates too much current draw on that circuit.
88 TC#1 Boport stg 3 alum dport head, PT6466, Boport header, CP pistons, Crower rods, MS2xtra
88 TC#2 drag car project(someday)
88 TC#3 parts car (just needed the header panel...bought the whole car, lol)
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Jeff K Offline
Administrator
#6
Measure amp draw with the DMM on a DC AMPS range connected between the batt neg terminal and the neg batt cable. Pull fuses until you isolate the drain. If pulling fuses doesnt work disconnect the output lead of the alternator. If drain goes away, alt has a shorted diode. Also pull regulator plug off alt. If drain goes away, regulator is bad. Even with extra stereo equipment, key off drain should be under 50 mA.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Go Roush Offline
Junior Member
#7
I changed motor lately and having trouble since. I will do the amp testing at fuses and go from there
03 Ford F150 Supercrew
07 Suzuki Boulevard C50T
1983 Turbocoupe
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Go Roush Offline
Junior Member
#8
Even more interesting I have power in my negative system, with the negative cable unhooked and test light hooked to negative terminal of battery I can hook the test light to anything and it lights up.
03 Ford F150 Supercrew
07 Suzuki Boulevard C50T
1983 Turbocoupe
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jmthunderbirdturbo Offline
Posting Freak
#9
alternator. unhook it, plug AND main power wire, and retest.

-J0N
APRIL 2018 - LOOKING FOR A NEW CAR. PM me if you have an 87-88 roller or cheap TF for sale.
1988 TC 5MT-Blue/Blue check-off car. resto-project.
2006 Honda Odyssey 5AT, baby-mobile.
2013 F-150, 5.0, 6AT, 4x4, snow white paint.
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Scott Mabe Offline
Member
#10
Go Roush Wrote:Even more interesting I have power in my negative system, with the negative cable unhooked and test light hooked to negative terminal of battery I can hook the test light to anything and it lights up.

Having the test light hooked up as described is completing the circuit and should light up if there's any draw on your electrical system.
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
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