c5 alternator charging issues
Thread Starter
Intermediate
Joined: Jan 2013
Posts: 35
Likes: 0
From: San Tan Arizona
c5 alternator charging issues
Hello All,
I just upgraded my 2004 LS1 engine with Port polished 243 heads, Lunati cam, long tube exhaust, Air Raid CAI, Stage 3 Transmission, and some small other items. Also had Professionally tuned/Dyno by Nic D (Excellent professional guy). I also had my water pump, valve covers, and alternator bracket powder coated. Here is the issue. I have to rev the RPM's about 4000 before the Alternator starts to charge around 13.3v (Which I think should be more than that). Also if i turn on any accessories it will read a lower voltage.Before I rev motor it is about 11.8v. I replace alternator and have new Optima Red top battery. I checked all ground locations they are all tight. Also these readings are from my DVM, not just from the display in car. I did research on internet and maybe starter connections, but I check all connections and they are tight. Any ideas would be helpfull,
Thank you in advance,
Jimmy
I just upgraded my 2004 LS1 engine with Port polished 243 heads, Lunati cam, long tube exhaust, Air Raid CAI, Stage 3 Transmission, and some small other items. Also had Professionally tuned/Dyno by Nic D (Excellent professional guy). I also had my water pump, valve covers, and alternator bracket powder coated. Here is the issue. I have to rev the RPM's about 4000 before the Alternator starts to charge around 13.3v (Which I think should be more than that). Also if i turn on any accessories it will read a lower voltage.Before I rev motor it is about 11.8v. I replace alternator and have new Optima Red top battery. I checked all ground locations they are all tight. Also these readings are from my DVM, not just from the display in car. I did research on internet and maybe starter connections, but I check all connections and they are tight. Any ideas would be helpfull,
Thank you in advance,
Jimmy
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Are you saying you replaced the alternator and battery with no change in the problem? Or, did you put them in as part of your work and now you have the problem?
Last edited by dadaroo; Jun 26, 2014 at 11:02 AM.
Thread Starter
Intermediate
Joined: Jan 2013
Posts: 35
Likes: 0
From: San Tan Arizona
this is what the battery reads
12.42Vdc when car is off. But when car is running I read 11.99Vdc. When i rev car up to 4500 rpm's the battery reads about 13.2Vdc. I had the battery checked by Autozone and they said it was good. This battery was in car before I did all my upgrades and it was good then. I did buy a new alternator and had them check the new alternator again.
Jimmy
Jimmy
