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electrical problem

I was wondering if any body has had this problem. I have an 86 bird equipped with the digital dash. I have upgradded to a 130 amp alt and it has worked fine for the last year the other day I started it and the alternator wouldn't charge. I thought the alt. was bad so i swapped it (lifetime warranty from autozone). After I  changed it the thing went full field and starting charging at 21 volts. What is the deal.  I am not sure if the digital dash has an IVR.  Any help would be very appreciated
1986 bird, 306, Dart heads, 550 lift cam, exp. intake, 50lbs injectors, 76mm C&L MAF, Procharger D1R blower 14lbs, 3 core intercooler, 55shot ZEX N20, tremec 5speed, 3.73 gears, auburn pro posi,headman full length headers, 3" exhaust
custom chip by 5.8FastCat

[SIGPIC][/SIGPIC]1955 bird 351w, AFR 185 Heads, 580 lift cam, D1R  Procharger 10lbs tremec 5speed, 3.92 Gears

2007 Hayabusa, R-22 pipes, K&N,  Power Commander
192hp


"Imports are like tampons, every p@$$y has one"

Re: electrical problem

Reply #1 –
I would be thinking voltage regulator. It seems like there a diffrent peice on alt.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Re: electrical problem

Reply #2 –
Quote from: Haystack
I would be thinking voltage regulator. It seems like there a diffrent peice on alt.


I had thought of that but the regulator is built in.

The alternator is a 3G 130 amp for a  1995 MUSTANG. Does anybody know if the digital dash is equipped with an IVR that controls the alt.  Because when I first put the alt back in the car it wouldn't charge. Then when i stomped the gas it went full field at 21 volts  :dunno:  :shoothead
1986 bird, 306, Dart heads, 550 lift cam, exp. intake, 50lbs injectors, 76mm C&L MAF, Procharger D1R blower 14lbs, 3 core intercooler, 55shot ZEX N20, tremec 5speed, 3.73 gears, auburn pro posi,headman full length headers, 3" exhaust
custom chip by 5.8FastCat

[SIGPIC][/SIGPIC]1955 bird 351w, AFR 185 Heads, 580 lift cam, D1R  Procharger 10lbs tremec 5speed, 3.92 Gears

2007 Hayabusa, R-22 pipes, K&N,  Power Commander
192hp


"Imports are like tampons, every p@$$y has one"