so i just finished building a 91 toyota pickup. its a 2wd on a 4x4 chasis. it wont start. im not getting power to the main relay. i checked the c.o.r and the main relay and thats when i realized that it is not getting power. the truck turns and wants to start. could it be the ignition or the ecu. the ecu came out of a junk yard, so i dont know the history on it.any ideas or help is greatly appreciated