200 AMP Alternator for 1990 2.9L

[PetroleumJunkie412]

Yes, you can buy 200-220amp alternators for 2.9l, not sure you could find one at wrecking yard

Alternator's output about 40% of rated amps at engine idle RPMs
Engine RPMs need to be close to 2,000 to get full alternator output

If you have power windows and AC then you will have the 75 or 80amp stock alternator

You can use a multi-meter with AMP setting to test alternator's output

Ron, are you the older gent named Ron in the "ask a Ford mechanic" ads I see everywhere online?

You know the one. The one that looks like your father judging you for being one of "those kids."

?? This guy

 

[RonD]

No, not me, never been a pro mechanic, I like working on vehicles when I feel like it, wouldn't be happy having to do it daily

But I am an old guy, 64 now

 

[OldMan2]

Young whippersnapper, but a very knowledgeable guy. He has helped me in the past.