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86 fox battery wont charge

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Old 03-25-2005, 11:51 PM   #1
pacepony
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Default 86 fox battery wont charge

i have a 86 mustang and the battery will not charge. the battery is good but i cant get power from the alternator to the battery. where is the voltage regulator and where should he wire from the alternator run to?
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Old 03-26-2005, 12:09 AM   #2
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Default RE: 86 fox battery wont charge

It's an internal regulator, if you check the voltage while the car is running, and it's too low, replace the alternator.
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Old 03-26-2005, 12:15 AM   #3
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Default RE: 86 fox battery wont charge

the alternator is putting out 12.8 volts but i dont know if it is gettin to the battery. is it a straight wire from the alternator to the solinoid, could i just run a new wire coming from the alternator?
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Old 03-26-2005, 12:21 AM   #4
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Default RE: 86 fox battery wont charge

12.8 isn't enough. While running it should charge at about 14 volts. Pull it out and take it to an auto parts store and have them test it.
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Old 03-26-2005, 12:58 AM   #5
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Default RE: 86 fox battery wont charge

where does the wire from the alternator go? so i can check if it getting to the battery
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Old 03-26-2005, 01:28 AM   #6
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Default RE: 86 fox battery wont charge

hm. Have you had any work done recently? Check to make sure you've got good ground connections from the alternator to the block, block to body, and battery to body. In my truck I run the main ground directly to the block.
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Old 03-26-2005, 01:58 AM   #7
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Default RE: 86 fox battery wont charge

i just bought the car and i trying to get it fixed
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Old 03-26-2005, 02:16 AM   #8
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Default RE: 86 fox battery wont charge

I'd make sure the negative battery terminal has a good connection to the block and chassis.
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Old 03-26-2005, 02:23 AM   #9
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Default RE: 86 fox battery wont charge

You have three wires going to alt? or 4? also the big wire is the feed wire to the bat the wire is direct to the solinoid. and the reason that you had 12.8 volts at that wire is because that is system voltage from the bat (current flows both ways ,(remember)) My guess if you have good grounds and you other wires going to the alt are ok then it is the alt. get it tested...............

Good luck,

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Old 03-26-2005, 04:55 AM   #10
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Default RE: 86 fox battery wont charge

have you not checked the battery with the car running yet (actually checked it at the battery)? if it's a new battery and the voltage is low, it's more than likely the alt.
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Old 03-26-2005, 10:25 AM   #11
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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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