High output c5 alternators?
Intermediate
Joined: May 2005
Posts: 45
Likes: 0
From: Mays Landing NJ
I was quoted $600 from the dealership for a replacement for my 02 C5. That was crazy so I ordered a remanufactured Bosch for about half that. Some on this forum warned of possible DIC error codes since the 110 amp original alternator is what the system expects. Aside from a straght pulley (as opposed to the stock clutch pulley) on the replacement, it seems to work well. Evil-Twin is supposed to know everything so I'm gonna PM him to see if I absolutely need the clutch before I return my old core. The local alternator/starter rebuild guy says these clutch pulley's are famous for failure. What exactly are they for? Sorry. didn't mean to hijack, I just wanted to share my alt experience.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
What year is your C5? If it is a 110 amp one even if it will work you will get charging system fault messages. To fix that you would have to reprogram the PCM.
Drifting
Joined: Jul 2006
Posts: 1,700
Likes: 60
From: Springfield IL
So I should make a new thread? Thanks for the heads up. I just had a spare alternator sitting here from a fire victim and didn't know if it could interchange between generations. It looked like it'd physically fit. Sorry.
Ps- I was going to turn the fire victim in as a core (it actually still tested good but looks bad), get a new alternator for my car, and sell the good 76k mile OEM one. That was my thought process
Ps- I was going to turn the fire victim in as a core (it actually still tested good but looks bad), get a new alternator for my car, and sell the good 76k mile OEM one. That was my thought process
Last edited by chpmnsws6; Feb 16, 2015 at 10:53 AM.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
Don't believe the BS you've read about the alternator interface. The only alternator to PCM interface is a PWM signal. The PCM has no clue if the PWM signal being 100% represents 110A or 140A. Even the regulator inside the alternator has no clue if the alternator is producing 110A or 140A when it's at 100% field output.
