S300 v3 without USB shuts down ..

[jose_mbk]

I have a Hondata S300 v3 in my civic, it stopped starting. If I connect the USB to the PC it starts up, when I disconnect it it turns off. The fuses are all good. How can the problem be? Thank you

[Spunkster]

Stop starting it with the USB plugged in or it will damage it. You have a bad ground somewhere and it is grounding through the USB. Check all grounds in the engine bay.