Upgraded alternator with UD pullies?

Mustang_289 · 12-16-2001, 08:04 AM

We're thinking about boltin on underdrive pullies and we may need to replace alternator (not charging battery), any suggestions on heavier alternator that will handle possibly a large stereo - amp size? Anyone had good success buying rebuilt alternators autozone, trak auto etc?

LOWKEY · 12-16-2001, 03:00 PM

I would upgrade to a later model ford alternator. Like one off of a 94-95 mustang. It will bolt right on with little trouble and puts out 130amps vs 65 amps (87-93 stang). There is some slight grinding that will need to be done to your bracket and a heavy gauge (4awg) charging cable will need to be run to handle the larger output. http://66.70.5.241/8793mustang.pdf

You can get one from a parts store, but I wouldn't recommend a reman alt to a mustang lover. I think PA performance's new 3g alternators are the same price anyway. http://www.pa-performance.com

If you really want to go overboard like I did... check out http://www.mean-green.com I guess I got a little fed up after going through 3 reman alts. This sucker puts out 100amps at idle.

Good luck
Brad

92Rustang · 12-16-2001, 04:01 PM

Dude I know Autozone has good prices ,but unless you like swapping parts every couple of months I would stay away. There is a reason they offer a lifetime replacement warranty, because there parts suck!

DemonGT · 12-16-2001, 07:06 PM

im going to upgrade to a 3g from a later modle stang later on..but i have a question bout my volt meter and charging...

ok i have a ford racing mechanical volt meter ...and some times when im driving it reads almost all the way up?? is that right..and if a alternator puts out 100 at idle ..arnt there electrical things in the car that could blow out..a freind of mine had a 89 grand prix with digital dash and his alt regulator went out and pushed to much volts and blew all his dash lights out? can this happen to a stang?

2FastLX · 12-16-2001, 07:38 PM

I upgraded to a rebuilt 95 GT alternator from Auto Zone and have had it almost a year now. It's still going strong. I have under drive pullies including the alternator pullie and it still charges a lot better than the original alternator did.

Highly recommended upgrade.

LOWKEY · 12-16-2001, 11:26 PM

DemonGT,

If you volt gauge is going above 14.5V somethings wrong. The regulator is probably toast. I mention 100amps @ idle, this is with a 700 watt stereo, markVII fan (45amps), lights on, and the heater on. My volt meter dropped from 14.2V to 13.5V.

Before I got the fan and while I still had the stock alternator it would idle at 13.5V (no underdrives) and drop to 12V when I turned everything on. 12V definetly isn't enough potential (voltage) to charge a car battery. I can't believe ford put a 65amp alternator on such a modern car. Anyway, I wouldn't worry about frying anything as long as you install a larger charging cable and an inline fuse.

Good luck
Brad

12-16-2001, 08:04 AM	#1
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	Upgraded alternator with UD pullies? We're thinking about boltin on underdrive pullies and we may need to replace alternator (not charging battery), any suggestions on heavier alternator that will handle possibly a large stereo - amp size? Anyone had good success buying rebuilt alternators autozone, trak auto etc?

12-16-2001, 03:00 PM	#2
LOWKEY Registered Member Join Date: Jan 2000 Location: greenvile, NC Posts: 161	I would upgrade to a later model ford alternator. Like one off of a 94-95 mustang. It will bolt right on with little trouble and puts out 130amps vs 65 amps (87-93 stang). There is some slight grinding that will need to be done to your bracket and a heavy gauge (4awg) charging cable will need to be run to handle the larger output. http://66.70.5.241/8793mustang.pdf You can get one from a parts store, but I wouldn't recommend a reman alt to a mustang lover. I think PA performance's new 3g alternators are the same price anyway. http://www.pa-performance.com If you really want to go overboard like I did... check out http://www.mean-green.com I guess I got a little fed up after going through 3 reman alts. This sucker puts out 100amps at idle. Good luck Brad __________________ 89' Notch Stroked Poked & BLOWN low 11's and it goes around corners too Parts for Sale!! http://www.lowkey.stangnet.com/catalog.html

12-16-2001, 04:01 PM	#3
92Rustang Registered Member Join Date: Feb 1999 Location: Smithton, IL, US Posts: 215	Dude I know Autozone has good prices ,but unless you like swapping parts every couple of months I would stay away. There is a reason they offer a lifetime replacement warranty, because there parts suck! __________________ 92 GT 5-speed Windsor Jr,E303,1.7RR,Cobra intake,65mm TB,155lph,24 lbs,75mm MAS,shorties,h-pipe, 2.5 flowmaster,Black magic,Holley adj fuel, 3.73 No times yet. 13.6 before heads,cam,inj,rr www.fordmustanggt.com

12-16-2001, 07:06 PM	#4
DemonGT Registered Member Join Date: Aug 2000 Location: Wisconsin Posts: 879	im going to upgrade to a 3g from a later modle stang later on..but i have a question bout my volt meter and charging... ok i have a ford racing mechanical volt meter ...and some times when im driving it reads almost all the way up?? is that right..and if a alternator puts out 100 at idle ..arnt there electrical things in the car that could blow out..a freind of mine had a 89 grand prix with digital dash and his alt regulator went out and pushed to much volts and blew all his dash lights out? can this happen to a stang? __________________ '91 GT,410W,10.5 to 1 comp,Victor Jr. heads,Victor 5.8 intake,FTI cam,Crane retro fit lifters,Scorpian 1.6 RR's,Melling HV oil pump,MSD distro.,Canton oil pan,FMS flywheel,Romac balancer,FMS timing chain,Accufab 90mm TB,C&L 76mm maf, 42lbers,HD clutch,K&N air filter,Mac long tubes,Pro dumps,powerchamber,FMS 9mm wires,180 thermostat,Ford Racing gauges,5inch Tach,centerline convo pro's,nitto DR's,Pro3i lower control arms,50/50 shocks,3.55 gears,TFS HD diff. cover Next year: Tremec TKO,Spec stage 3 clutch,alum driveshaft,complete fuel system www.angelfire.com/linux/demondan

12-16-2001, 07:38 PM	#5
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	I upgraded to a rebuilt 95 GT alternator from Auto Zone and have had it almost a year now. It's still going strong. I have under drive pullies including the alternator pullie and it still charges a lot better than the original alternator did. Highly recommended upgrade. __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

12-16-2001, 11:26 PM	#6
LOWKEY Registered Member Join Date: Jan 2000 Location: greenvile, NC Posts: 161	DemonGT, If you volt gauge is going above 14.5V somethings wrong. The regulator is probably toast. I mention 100amps @ idle, this is with a 700 watt stereo, markVII fan (45amps), lights on, and the heater on. My volt meter dropped from 14.2V to 13.5V. Before I got the fan and while I still had the stock alternator it would idle at 13.5V (no underdrives) and drop to 12V when I turned everything on. 12V definetly isn't enough potential (voltage) to charge a car battery. I can't believe ford put a 65amp alternator on such a modern car. Anyway, I wouldn't worry about frying anything as long as you install a larger charging cable and an inline fuse. Good luck Brad __________________ 89' Notch Stroked Poked & BLOWN low 11's and it goes around corners too Parts for Sale!! http://www.lowkey.stangnet.com/catalog.html

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