I get communication when in the accessory position however when I switch the key to the on position I lose communication and megasquirt box no longer illuminates. the fuel pump will continuously run it if I have no grounds to the ecu and everything is all in good with an accessory position. and my car won't start. please help has anybody experienced this and if so do you have any troubleshooting advice.

 

Is this a Gen1 MSPNP or Gen2 model?

It is a true MSPNP and not a harness adapter or DIYPNP that's been built up and sold right? We need to know this to ensure we offer the proper support, we'll help with either, just need to know what you've got there.