LS4 Performance - Charge system failure HELP
06-19-2010, 03:54 PM
Need some opinions on this. I just put headers and exhaust on my GXP. When I drive down the road at random times my DIC comes up saying charge system failure and I notice my volts will go up to 16 and then they come back down to 14. Had the alternator checked while in the car and came up good. Any idea's or help would be appreciated.
06-19-2010, 04:31 PM
06-19-2010, 08:03 PM
i would suspect the battery, mine did that with the old delco battery a couple days before it failed.
06-19-2010, 08:27 PM
X3 on the battery...Headers and exhaust might just have been a coincedence
also make sure the battery cables are tight.
06-19-2010, 10:58 PM
ive had that light 2 times now, but still no issues
06-20-2010, 08:05 AM
overvoltage could be battery or more likely a diode bridge going bad in the alternator. Anyone measure underhood temps with he headers vs. Stock? The stock manifolds keep the engine bay pretty hot to begin with, perhaps the headers raise it enough to start cooking the alternator or maybe damage wiring that is too close (are the heat shields put back on?) either of those problems would likely not show up when they are cooler, like in a test right after start up or on a bench.
06-20-2010, 09:23 PM
Thanks for the input. Changed batteries today and that didn't help so gonna change alternators now.
06-20-2010, 11:28 PM
i get that if i have ac power on the car for awhile without the car being actually on. so i dunno man...
06-21-2010, 12:00 AM
it is your battery i had the same problem in my car
06-23-2010, 08:11 PM
ok I think I figured it out. Put a new alt on the car and that didn't work. So I am in the car reving and am pissed off about spending 300 bucks on a bat and alt and nothing working. Then the warning flashed again and I looked at the temp gauge and thought it was running hot and it dawned on me to check my fans. Sure enough they were not working so I am assuming when the computer tells the fans to kick on its making more power to turn them on and then they don't come on and that whats giving me an overcharge spike.
Is this a dumb thought?