Hand held calibration module

[Jan]

Hi, I have innstall the Pro Flo 2 on a chevy 427

As soon as i connect the hand held module the 3 amp fuse broken, but i can still use my laptop.
Can you please help me?

[S. Armish]

Is the key turned on when you connect the DB9 connector?

[Jan]

NO, the key is not turn on.