Started up yesterday we are building it up custom and installing all new stuff . Wire came off alarm and later it would not start. Any ideas

 

Can you elaborate on what you mean by the wire came off the alarm?? Are you installing an aftermarket remote start / alarm? Need a lot more detail on your problem

 

on after market alarm a clip with 3 wires on it came off alarm that I have since remover entire system and removed all wires now looking into ECM today to get this thing to start again. Any ideas are appreciated

 

I would start by looking online for the specific brand and model of the alarm system to figure out how it's wiring is done for the alarms starter disable function. Then you might be able figure out what factory wires need to be connected back together.