How to Megasquirt your 3G Hemi
Main power for the engine management system:
Megasquirt relay (feeds MS3 and second relay):
12v feed #87: from battery
12V out #30– into two wires:
-to MS Box main pin 28 (through 3A fuse)
-to fuel pump relay
Switch feed #85 – from ignition (needs to be hot during crank AND when key in on position – more on this later)
Ground #86
Fuel Pump Relay (feeds fuel pump(s), injectors, coil packs, and O2 sensor):
12v feed #87: from #30 MS3 main relay
12V out #30– into fuse panel (feeds fuel pump(s), injectors, coil packs, and 02 Sensor)
Switch feed #85 – from #30 MS3 main relay
Ground #86 – Pin 37 on the main Megasquirt connector (will switch off fuel pumps if motor isn’t running or cranking)
from msextra.com
from msextra.com
Main power for the engine management system:
Megasquirt relay (feeds MS3 and second relay):
12v feed #87: from battery
12V out #30– into two wires:
-to MS Box main pin 28 (through 3A fuse)
-to fuel pump relay
Switch feed #85 – from ignition (needs to be hot during crank AND when key in on position – more on this later)
Ground #86
Fuel Pump Relay (feeds fuel pump(s), injectors, coil packs, and O2 sensor):
12v feed #87: from #30 MS3 main relay
12V out #30– into fuse panel (feeds fuel pump(s), injectors, coil packs, and 02 Sensor)
Switch feed #85 – from #30 MS3 main relay
Ground #86 – Pin 37 on the main Megasquirt connector (will switch off fuel pumps if motor isn’t running or cranking)
from msextra.com
from msextra.com