said by billydunwood:
I just fixed it, sorry guys. It was P2609, P2509 and P1740
P2609 - No voltage drop from intake heater. The ECM didn't see the heater cycle.
P2509 - Intermittent ECM/PCM power input signal.
P1740 - Sorry no idea. Only know Cummins specific codes. It isn't on my list.
You sure one battery didn't get hooked up backwards? Sounds like something fried or shorted from the acid maybe.
EDIT: Not sure on the B series but the M, N, ISM, ISX, ghost codes can happen from things like this and can sometimes be hard to reset.