hi all new member with an 07 z06 stage 2, borla exhaust. having trouble with charging system. new battery, new alternator, but battery not charging and im reading 12 at the battery and like 8 at the alt. so im losing 4 somewhere? any ideas where to look? im going to start tracing the wires and checking grounds maybe from alt to starter?

 

If you're testing with the car running the voltage drop is what the car is using.. since that is an internally regulated alternator remove it and have it tested. I have gotten bad ones before.
Good luck, keep us posted.

 

I will remove it and have it tested. I was also going to see if there is some parasitic draw some where? the car has been through a lot lately it all started with a dropped valve and then engine rebuild and up grade to stage 2 but before all that I do remember having charging/electrical issues after I put a new head unit in? hmm that's got me thinking about something else. anyway thank you Harley I will let you know what I find out.

 

The parasitic draw would leave you with a dead battery after a few days. Your alternator should put out more than 100 amps. Nominal voltage when running should be between 13.6 and 14.8 volts. If your battery is low it could be a little higher. Test at about 2000 rpm. Good luck!

 

hi Harley thanks for help. so today i was able to get the alternator charging at 15 but back at the battery like 12? how come its not getting the same at the battery? i was thinking maybe i have the wires mixed up? its a oem Bosch alt 140 amps and i have four wires one goes nowhere then red/white then grey then orange. the red/white goes to fuze box, the grey goes to the ecm? and the orange goes to starter? is that correct? i don't see any blown fuzes and the grounds are good so its weird no? **** i hate electrical ****! appreciate you man.

 

i think i have found the problem? the alternator it self is the problem. iv been hearing and reading my car likes the gm ac delco. replacing tomorrow. all the wires are good, fuses good and starter is good.