I have a Komatsu pc300-7 and has always ran fine until it just shut off like you turned the key off. It started right back up then shut off right after and now will not start. I have fully charged batteries but I have no power in the cab. No power at the key switch no power at the controller I don’t think it’s a broken wire because all the wiring looks very good. I’m just looking to see if anyone might know the first place the power goes in the cab after the battery. Thank you
Might be worth checking the fusible links in the battery compartment. Please see attached screenshot.
What is the model number on the engine? The issue is as likely to be a fuel problem as it is an electrical issue.