Originally posted by streetlightning
Can i use one relay triggerd off ignition to power my alt, ms, fuel pump, injector 12v and coil 12v?

Your Megasquirt ECU should be activating the ASD relay. It can't activate this relay if it's also powered by it!

Since you removed the stock harness and you seem a little confused about its structure, perhaps you should review the stock wiring diagrams before proceeding. Click the link in my signature line to download a copy of the FSM's electrical guide.