Alternator testing...

[Eric VerValin]

Well I was curious about my alternator, as I can hear the bearing in it now, and know sooner or later its gunna need a rebuild again. But my question is this. I have 25% reduced UDP's and a 92 alternator which *should put out a max of 90 amps? Well at 2000 RPM mine was testing 51.2 amps. Is that about right? Seems 25% less of 90 would be more like 75amps. Or was the engine speed still a little low for such a test?

 

[AREA 91]

I have the SHO SHOP 3 UDP's on both my cars. Off the top of my head, the alt puts out full charge just off idle, like 1200-1500 RPM.

 

[Eric VerValin]

Hmm... guess I only have about 1/2 of my brush material left then .. I haven't fixed it yet, because I kinda like the whine it puts off. Kinda sounds like a 6lb blower.

 

[AREA 91]

Another FYI, Both of my 91 alt's are origional! 150K and 148K.
Both have group 34 Red Top Optima's.

 

[Eric VerValin]

Well this one has 189k on the clock.. so I guess you could say I'm happy with what its done so far. Wait a sec.. I think i'm up to 192k now..