What kind of aftermarket upgrade alternators have you guys used? i'm looking for an upgraded alternator with higher amperage. I'm also looking for ultimate reliability, cuase i hate when my truck breaks, it only lets my chevy drivin friends think their right! Thanks for any opinions.

 

I "Think" there was an OEM optional 130amp alternator available.
(not sure) that would bolt right up. Otherwise the 130 amp was availible on the newer 4.6 vehicles.

 

i have an HO alternator from www.mralternator.com it is rated at 170 amps although most aftermarket alternators do not put out the rated power at idle. Mr.alternator is the same way. they are cold rated and the output goes down as they heat up, but they cost 200 doillars and provide much more power thana stock alternator. They put them in cases for your particular motor. you can get 100 - 200 amp alternators from them.

 

Go to the parts store or the dealer and tell them you want a 165 amp alternator for a 1990. My book says they were available starting that year from the factory.