So I just installed my supercharger, but there were no modifications to the electrical charging system. Can anyone tell me if these voltages are within spec? Is the new belt overdriving the alternator? I've got a reoccuring code of P2504.

The alternator is putting out 14.6 to 14.8 at idle.
Battery is 11.89 to 12.34 with the Jeep turned off
Battery output when Jeep is running is 11.41

 

14.7 is OK with the engine running (idle or driving). 11.89 to 12.34 is very low if measured right after shutting off the engine -- should read ~13.x and drift down to ~12.8 over several minutes.

But why does it measure so low (11.41) with the Jeep driving? That would mean there is a very large current draw beyond alternator capacity, or the alternator is not putting out enough current. What type of supercharger is this? Is there an associated electrical load?

 

Wild guess: Presuming it's a belt driven SC using a serpentine belt with the alternator, check how the belt is driving the alternator -- maybe it is slipping at higher RPM's, installed incorrectly, something in that area.

 

Thanks for the response Mr. T. I had an ID10T error (idiot) on my part.
So there is this green wire that connects to the pos battery therm...yeah that's the alternator charging path.
This caused the alternator voltage regulator to say it was high and that voltage drop on my battery.

 

Glad you figured it out quickly. I'm sure you didn't want to go to sleep thinking about it.

Please post back later how you like the SC.

 

Will do. Just watch that "who's running a Sprintex" thread and I'll post some comments after a longer test drive tomorrow.