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In the PCB there is something called a reverse polarity relay that will inhibit starting to protect the truck if the batteries get installed backwards so it is possible that you have a bad PCB but with their high cost I'd make sure it was the problem before changing it out. Kurt

If you jumped it from the STE/ICE connector and it worked you just verified the starter and solenoid are good. The start switches do fail occasionally. I'd also look for a broken wire or a separated connector. Kurt

For all of you new and old HMMWV owners here's one of the best troubleshooting guides I've seen for the HMMWV: https://hummerhuren.files.wordpress.com/2013/01/hmmwv_test-diagnostics.pdf Other than that, download the HMMWV manuals and learn how to follow their troubleshooting flow charts...