Electrical 91 GT Alternator Replacement Question

[willrh111]

Hello All,

Sorry if this has been posted already, new to the thread; but I have a 91 gt with some whining noises coming from the alternator, which you can hear over the engine, and increases with revs. The only issue with the alternator ATM is the noise, and I suspect the bearings are going bad. The pulley does wiggle slightly up and down when I took off the serpentine belt.

My question is would there be an issue if I replaced the alternator with a higher amperage one? I don't see any markings on what is currently installed, but looks like a new stock replacement. Stock replacement says 75amp works, but am interested in a 90 amp PA Performance alternator. Will I need to upgrade the wiring or other ancillaries too? Should I go higher or lower than 90amp? (it has after-market, higher output headlights, and small stereo/amp/sub).

 

[Mustang5L5]

Wouldn't be a bad idea to upgrade the wiring. The stock setup is two 10g wires in parallel, which really isn't ideal even for the 75A setup that was stock. One poor connection away from a fire. A 4G power wire should be adequate for any 90-130A alt. WIring changes are minimal but it depends on if you get a rewound 2G alt for higher amperage which may be plug and play, or do a 3G/6G conversion.

Average Fox with E-fan and small stereo doesn't really need a whole lot more than 100amps. How often do you run everything (lights, wipers, heater on MAX, e-fan, while rolling windows up and down with the defroster on) at once?

 

[gkomo]

The alternator upgrade is so common you can buy a kit to do it:

https://lmr.com/item/SVE-17046K2/Mustang-SVE-130-Amp-Alternator-Upgrade-87-93-50L

Just as an example. I have no clue if the SVE kit is a 'good' one or not.

 

[AeroCoupe]

Resource icon

3G Alternator Fox Upgrade

Aug 2, 2013

3g Alternator Upgrade Into a Fox Mustang.

• Noobz347
• Installation Articles

 

[nickyb]

The 3g alt upgrade is one of the easiest and less expensive ones that you can do for your stang.

 

[General karthief]

You need to pay attention to the exhaust 'back pressure ' caused by installing a higher out put charging system, takes power to move all those amps around and the resulting 'back pressure ' from the excess power used can only be relieved by cutting the tail pipes off and creating 'dumps'

Yeah, OK, I've been hang 'round the 'Facepage' too much.....

 

[nickyb]

General no more gummies for you today.