ok guys, here is how i plan to wire my Megasquirt. it differs from the original posted diagram but will work the same.. this way just seems easier to me so here it goes...
ill be keeping the factory main relay, and B38 plug under the dash. I will also be keeping the factory wires for the fuel pump, oil pressure gauge, and water temp gauge...
here is what im starting with, as you can see there are three wires that run from the B38 plug to the main relay.. this supplies power to the relay from the battery, and activates the relay when you turn the switch to cranking, and one that keeps the power running through it once the switch is released to ON.
here you can see the three wires running to the B38 plug and also that there are 4 wires that have been cut..
1 wire is the input from Megasquirt to keep the fuel pump on
1 wire is the output to power the injectors
1 wire is the output to power the Megasquirt unit, and the EDIS control module
1 wire is a ground for the relay, grounded to the body.
here you can see the input wire from the Megasquirt, to keep the fuel pump running once the ignition switch is turned to ON
here you can see the output wire that will power the injectors, this wire will be split, then those wires will run through their own 5 amp fuse, and from the fuse block, the wires will split again, and power the 4 injectors.
here you can see the output wire that will power the Megasquirt unit, and the EDIS control module... this will will also be split and run to a fuse block one branch will run through a 2amp fues and back to the power wire for the Megasquirt, the other branch will run through a 15 amp fuse and to the power wire on the EDIS control module..
here you can see the ground wire, that gets grounded to the body of the car.
here you can see the factory wire that will power the fuel pump, im even going to keep the factory "test" wire.
here you can see the B38 plug, this is the plug under the dash. in this plug you will be actually using 5 wires, 3 wires run to the Main factory relay. The other two are for your oil pressure, and water temp gauge.
here you can see that i have pulled out the oil pressure and water temp gauge wires, i will rerun these later to rerun them later to the proper sending unit. if you use these wires you and your factory gauge sending units, your factory gauges will still work properly.
here is a closer view of the wires that will run to the oil pressure sending unit, and the water temp sending unit
Edited by 19cturbo, 09 November 2011 - 09:27 PM.