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Dual ECU Injector drive harness wiring to Injector harness
Dual systems use injector relays. Harnesses from the ECU Molex 16pos connector to injector relay
box(es) come pre-built and plug right into the ECU’s and Relay box(es).
Injector output 20ga colored wires exit the Injector Relay Box connector(s), are usually 6-1/2 to 10ft long
and need to be routed to the engine bay where they will connect to the injector harness wires via black
Weatherpack connectors. Cover these wires with your desired fireproof sleeve or conduit. Route wires
through the firewall, bulkheads or baffling and use grommets. Also know the cylinder numbers on your
engine and route colored wires to the proper bank of cylinders, numbering may be different from these
diagrams. Don’t trim wire length until you check length of the Injector harnesses. Weatherpack crimping
info is below wiring diagrams. Wiring diagrams below will show wire colors and help you plan wire
routing.
4cyl wire colors are black, red,
green and white, 6cyl orange
yellow, green gray white purple.
You will also need to wire up your
own breakers and run your own
+12v supply wires out directly to
each injector + terminal on each
injector pigtail harness. Four wires
on a 4cyl engine and 6 wires on
6cyl engine.
Injector output wire colors 4 cyl:
Black to Cyl #1
Red to Cyl #2
Green to Cyl #3
White to Cyl #4
Injector output wire colors 6 cyl:
Orange to Cyl #1, Yellow to Cyl #2,
Green to Cyl #3, Gray to Cyl #4,
White to Cyl #5, Purple to Cyl #6
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