Running the crank pulley will screw with the charging. If the alt pulley is smaller than the one currently on the truck, run that too.

 

ill call hughes tomorrow and see if they can give me a diameter size then i will measure my stock one, and if it isnt smaller then ill just buy and install the crank pulley. i just didnt wanna make mess with charging cuz i have a compressor for my train horns and e fans..

 

bumpp

 

Uuhhhhh... I's confuzzled. If, say, the crank pulley is 10% smaller than stock, and the alternator pulley is likewise 10% smaller than stock, then the ratio is the same as stock... and the alternator will whirl around at the same speed as it did when there were stock pulleys in both locations. So, uh, where's the accelerated wear coming from?

Ain't nuthin' wrong with kicking the alternator speed up a few percent, anyway. They'll be able to make more energy at idle, and will run cooler which is very good news for the rectifier diodes.

 

well the crank pulley is 30% underdrive and alternator is 25%. just want some clarification before i order the wrong thing ya know. i read somewher eon here that ppl were saying run just the crank pulley and it wont affect charging as much.

 

I take it the alt pulley is 25% OVER drive? For a net of 5% underdriven? That doesn't sound so bad. With the e-fans, and such, I don't think a 30% underdrive would be very good for ya at idle.

 

bumpp

 

i run hughes 30% underdrive pulley with no problems. doesnt bog down i have noticed at a light only sumtimes my bat will be under 14 but thats it its not every time either. i do not have e fans.

 

could u tell a difference with the hughes pulleys?

 

All i have is the underdrive pulley. I really didnt feel a difference but u might. If u got all 3. Didnt really see much in the butt dyno. But every mod helps aint really gonna feel a 5-7 hp inscrease in ur seat