1984 gt alternator problems help

mutlyi4 · May 18th, 2011, 11:19 PM

my 84 gt 5.0l is charging 16volts i have replaced the voltage regulator and the alternator tested good what could cause this im lost

cjrulesdotcom · May 18th, 2011, 11:41 PM

are you looking off of the voltage gauge or are you using like a multimeter on the battery. i thought i was having a charging problem and it turned out that the gauge is reading wrong.

mutlyi4 · May 18th, 2011, 11:48 PM

i used a multimeter and it blew my ignition module and coil as well

cjrulesdotcom · May 19th, 2011, 12:20 AM

it blew them by using a multimeter on the positve and negative terminals of the battery? im stumped

ryanw · May 19th, 2011, 12:24 AM

what year did they start putting the volt regulators inside the alternator

mutlyi4 · May 19th, 2011, 08:49 AM

no my alternator overcharging blew the module and coil not the multimeter

and the internally regulated alternator started in 85 i believe

mutlyi4 · May 19th, 2011, 07:38 PM

anyone have any ideas im lost here?????

Ohsplat · May 20th, 2011, 12:36 AM

Originally Posted by mutlyi4

anyone have any ideas im lost here?????

1 Did you get the regulator from Advanced auto or Autozone? If yes its possible it is defective since they sell very cheap parts.

2 When did the problem start? Did you replace anything or add anything before this started to happen?

mutlyi4 · May 20th, 2011, 01:16 AM

i did get it from autozone but have warrantied it twice and no i didn't change or do anything it just started overcharging

Ohsplat · May 20th, 2011, 01:59 AM

Are you saying you retuned it twice? or bought 2 warranties on it? Theres really nothing else it can be. The external regulated charging system is very straight forward. I do believe you need to start following the wires from the alt, to the regulator, and thru the harness. A short may somehow be causing a bypass on the regulator. Check the plug that goes into the regulator as well.

oldfox · May 20th, 2011, 03:23 AM

Hey, Just my .02 I had a bad battery (cell was shorting out ) and it caused an over charge. I found it when I unhooked the battery while the car was running and the volts jumped down where they should be.

but I don't think unhooking the battery while the car is running is a good idea.
But that's how I found it. Lee

Ohsplat · May 20th, 2011, 03:45 AM

Unhookin the battery while running is ok, i have done it tons of times. A bad cell could cause a short.

mutlyi4 · May 20th, 2011, 08:53 AM

ok thanks for the ideas ill try checking the battery next

oldfox · May 20th, 2011, 09:34 PM

Let us know what you find

May 18th, 2011, 11:19 PM	#1
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	1984 gt alternator problems help my 84 gt 5.0l is charging 16volts i have replaced the voltage regulator and the alternator tested good what could cause this im lost

May 18th, 2011, 11:41 PM	#2
cjrulesdotcom Regular 1992 Mustang LX 13.8 Join Date: Mar 2011 Location: Dayton, Ohio Posts: 58 iTrader: 0 reviews	are you looking off of the voltage gauge or are you using like a multimeter on the battery. i thought i was having a charging problem and it turned out that the gauge is reading wrong. __________________ 70mm TB, 75mm MAF, BBK CAI, Edelbrock upper and lower intake, 30lb injectors, Port/Polished E7 heads, some cam, bbk short headers full flowmaster exhaust with H pipe RUNNING ON E85

May 19th, 2011, 12:20 AM	#4
cjrulesdotcom Regular 1992 Mustang LX 13.8 Join Date: Mar 2011 Location: Dayton, Ohio Posts: 58 iTrader: 0 reviews	it blew them by using a multimeter on the positve and negative terminals of the battery? im stumped __________________ 70mm TB, 75mm MAF, BBK CAI, Edelbrock upper and lower intake, 30lb injectors, Port/Polished E7 heads, some cam, bbk short headers full flowmaster exhaust with H pipe RUNNING ON E85

May 19th, 2011, 12:24 AM	#5
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	what year did they start putting the volt regulators inside the alternator __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

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May 18th, 2011, 11:48 PM	#3
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	i used a multimeter and it blew my ignition module and coil as well

May 19th, 2011, 08:49 AM	#6
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	no my alternator overcharging blew the module and coil not the multimeter and the internally regulated alternator started in 85 i believe

May 19th, 2011, 07:38 PM	#7
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	anyone have any ideas im lost here?????

May 20th, 2011, 01:16 AM	#9
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	i did get it from autozone but have warrantied it twice and no i didn't change or do anything it just started overcharging

May 20th, 2011, 01:59 AM	#10
Ohsplat Enthusiast 1983GT No motor or trans Join Date: Nov 2010 Location: Middle River MD Posts: 540 iTrader: 0 reviews	Are you saying you retuned it twice? or bought 2 warranties on it? Theres really nothing else it can be. The external regulated charging system is very straight forward. I do believe you need to start following the wires from the alt, to the regulator, and thru the harness. A short may somehow be causing a bypass on the regulator. Check the plug that goes into the regulator as well.

May 20th, 2011, 03:23 AM	#11
oldfox Regular Join Date: Dec 2009 Posts: 71 iTrader: 0 reviews	Hey, Just my .02 I had a bad battery (cell was shorting out ) and it caused an over charge. I found it when I unhooked the battery while the car was running and the volts jumped down where they should be. but I don't think unhooking the battery while the car is running is a good idea. But that's how I found it. Lee

May 20th, 2011, 03:45 AM	#12
Ohsplat Enthusiast 1983GT No motor or trans Join Date: Nov 2010 Location: Middle River MD Posts: 540 iTrader: 0 reviews	Unhookin the battery while running is ok, i have done it tons of times. A bad cell could cause a short.

May 20th, 2011, 08:53 AM	#13
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	ok thanks for the ideas ill try checking the battery next

May 20th, 2011, 09:34 PM	#14
oldfox Regular Join Date: Dec 2009 Posts: 71 iTrader: 0 reviews	Let us know what you find

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