Voltage Spike Issue

[squares98]

Tonight my voltage guage basically pegged to the right, causing the battery light to come on

When I start the car the voltage reads about 2v too high, when i touch the gas pedal the guage will peg. I had to turn off my stereo because the subs on the mach 460 kept on loosing/then regaining amp power.

Ive searched on the subject and found topics concerning the voltage regulator inside of the alternator. This does make sense to me. The alternator was always slightly audible but now it has a pretty noticable whine when you tap the gas.
Any Ideas?

also it idles fine and the needle drops down to m on normal but when you tap the gas it swings right just as quickly as the tach.

 

[03ghoststang]

do yo have a capacitor for teh amp so the alternator dosent take a hard hit everytime the bass hits, but you need a new alternator

 

[Stangdriver1119]

i agree sounds like the alternator...or else something is shorting intermittently if your battery meter pegs for a sec then goes back to normal

 

[squares98]

Well the car is dead this morning which =bad voltage regulator(alternator). Just replaced the battery 1 month ago, but it could be part of the problem.
My question is.. should I replace the alternator with the 04' ford part replacement or the 98 part number replacement. The engine came with the 04 part obvoiusly, but would the 98 maybe work better?