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Ford Ranger ECM wiring
M4wdFab:
OK got mine going tonight. for what ever reason power to the coils was lost.
here is my summary after 2 nights of scratching my head and double checking things / pining out the ecm blabla.
(1) gut all wires from truck chassis, leave ECM harness to Engine untouched, cut wires at engine bulkhead connector on driver side of engine near brake booster, i left them about 2' long.
(2) from the wad of engine connector wires, discard all but the solid yellow wire (ecm keep alive), solid red wire (ignition wire), Red with green trace is ignition coil power, and two heavy gage black with white stripe wires ( ECM grounds). nothing else is needed. Purple wire is OBD signal if you care. power and ground to these connections the motor will fire with fuel and a cranking starter motor.
(3) Alternator kick wires need fused ignition power also. It's a grey connector with two wires yellow and green both need power for the alt to charge.
The easiest way to stream line the new wiring is to use a master disconnect and a push button for starter motor cranking. (1)Master disconnect supply side hook up a small 2 amp fuse for PCM keep alive. (2) maintain alt charge wire connection (3)Master disconnect load side ON hook up feeds for fused power to fuel pump, (4)fan, (5)ignition/coil, (5)alternator kick circuits. My truck the disconnect feeds 4 maxi fuses cut from 1 section of the OEM fuse box.
done.
M4wdFab:
Engine Connector
3 wires needed from engine connector
two grounds, green with yellow stripe (later found not needed, fuel pump input), solid red (+12 ignition), solid yellow (+12 keep alive)
power jumped to coil power, center pin on 3 pin plug.
ECM pins checked per above
JEEPWERX:
Nice job thanks for documenting so well Smike.
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M4wdFab:
id like to know if yours or Mikes needs coil power jumped, or if i cut something i shouldnt have.... i didnt feel like pulling apart the engine harness to follow the OEM coil power.
JEEPWERX:
K
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