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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-26-2005, 10:25 AM   #11
86HOGT
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Default RE: 86 fox battery wont charge

Just check the voltage at the battery when it's running, if it's not even close to 14 volts, take the alternator out, test it, and have it replaced, not a big job...
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Old 03-26-2005, 10:47 AM   #12
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Default RE: 86 fox battery wont charge

does the alt have a race pulley on it?
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Old 03-27-2005, 12:13 AM   #13
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Default RE: 86 fox battery wont charge

i took the alt and got it tested and it is good. i brought it back home and hooked everything back up check all the wires and still nothing. the guy before i had it changed the wiring harness and im trying to make sure he didnt forget a wire. the alt has the two plugs and when the alt is hooked to the soleniod both plugs have power but its the power from the battery. i checked the battery with a voltmeter while the car is running and it is the same as before, around 12.5. does the same wire that gives the alt power, is that the same wire that charges the battery or is there another wire im missing, i can only find one that goes from the alt to the battery. i lost and really need to get this thing fixed. i have been called out by a srt4
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Old 03-27-2005, 12:15 AM   #14
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Default RE: 86 fox battery wont charge

is this a stock alt or a 140 amp?
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Old 03-27-2005, 12:20 AM   #15
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Default RE: 86 fox battery wont charge

stock with regular pulleys
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Old 03-27-2005, 12:53 AM   #16
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Default RE: 86 fox battery wont charge

put a chevy alt on it
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Old 03-27-2005, 01:19 AM   #17
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Default RE: 86 fox battery wont charge

is there any way to rewire the alternator. does anyone know where the wires come from and where they go, i really would like to get this thing running
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Old 03-27-2005, 01:40 AM   #18
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Default RE: 86 fox battery wont charge

You say the alternator was checked and it's good, so just for giggles, have you checked the fuses? Could be as simple as a blown fuse. If the fuses are OK, have you tried running a wire from the - post of the battery to the housing of the alternator. I have seen them have a bad ground and not charge. I would do the above before going to deep into the wiring. Then if those are OK, I'd check the voltage at the alterator terminal where the big wire connects. If it's OK, then you have a problem with the wire from the alternator that supplies the battery, via the solenoid post (maybe a fusible link or broken wire).
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Old 03-27-2005, 02:05 AM   #19
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Default RE: 86 fox battery wont charge

i dont think the wire is bad because when i unhook the wire from the solenoid the alt looses power so i know its getting from the battery to the alt but i dont know why its not charging. i ran a ground wire from the alt to the body just to be sure its grounded. how can you check to see if the alt is actually getting power. its shows power on both plugs but its just the battery power. does the alt get power and charge through the same wire??
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Old 03-28-2005, 03:00 AM   #20
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Default RE: 86 fox battery wont charge

still not working. is there anyway i can splice into some wires and run some new wires just to see if it will charge?
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Old 03-28-2005, 03:00 AM
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1986, 50, 86, alternator, battery, car, charge, ford, fox, gt, location, mustang, terminals, wire, wont

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