GM 4-Pin HEI Electronic Ignition Control Module Wiring
Connections/Diagram with the Cube-Shaped 3-Wire Inductive Proximity
This ignition system operates with full 12 volts. This is a thoroughly
tested, researched and proven reliable ignition system invented by Brian
Miller for ordinary lawn & garden engines and competition pulling engines.
With most tractors, the ignition conversion can be made with the engine in
the tractor. The only modifications that need to be done is the flywheel
shroud needs to be loosened to access and replace the Trigger Module, and
two holes will need to be drilled and tapped with the 2 supplied screws in
the kit. To install this replacement ignition system; the ignition coil mounts
in place of the Breakerless Ignition coil; the proximity cube sensor/bracket
mounts in place of the Breakerless Ignition Trigger Module, which is located
at the 10:30 position on the bearing plate; and two 9/64" holes will need
to be drilled and tapped (with the two self-threading screws are supplied
with the kit) on the backside of the bearing plate, on the left side when
facing the flywheel, to mount the GM HEI ignition control module. Be sure
to apply the supplied dielectric grease between the module and bearing plate
to dissipate the operating heat.
The coil and/or module may burn up if the ignition switch is left on for
more than 5 minutes with the engine not
List of Parts in Kit Includes:
New high output cube-shaped 3-wire inductive proximity sensor w/mounting
adapter and two Allen head mounting screws w/lock washers.
New high quality GM 4-pin HEI electronic ignition control module w/packet
thermal paste and
two 8-32 UNC x 5/16" hex head
self-threading screws (not self-tapping).
One 3/16" and three 1/4" slip-on crimp wire connectors (for module), three
3/16" ring crimp wire connectors (for ignition coil and ground W terminal
on module), and two nylon wire clamps (loops) to secure wires in place.
New 12 volt canister ignition coil w/mounting bracket/clamp.
New 10" or 13" length metal core spark plug wire. IMPORTANT - Due
to length of spark plug wire, please indicate if original coil is mounted
next to carburetor (10" length) or above starter motor (13"
New Autolite 216 or Champion 844 (H10C) spark plug. Set spark plug gap at
.035" with this system.
Fasten the cube-shaped proximity sensor on the two bosses that's on the bearing
plate with the supplied Allen head screws and split lock washers. If there
are no threaded holes in the bosses, drill with a 5/32" bit, and cut 10-24
UNC threads in the bosses. Route the insulated wires on the sensor through
the hole in the bearing plate.
Mounting of module requires
two 9/64" drilled holes. To install module behind bearing plate, use a
close quarters power drill or use an ordinary 3/8" power
drill with a custom-made 7" length x 3/8" diameter drill bit extension with
a 9/64" drilled end hole and two Allen set screws to secure the 9/64" drill
bit. (As shown to the right.) If engine is equipped with a mechanical fuel
pump, it will need to be removed for installation of the module, then reinstalled
Use the two supplied 8-32 UNC x 5/16" hex head self-threading screws to fasten
HEI module with the supplied dielectric grease between the module onto back
of bearing plate or an aluminum plate with cool circulating air to dissipate
the operating heat. Mounting holes in module body must be grounded to
engine/chassis ground (battery negative () post).
Connect the BLACK
wire on the sensor to the [G] terminal on the module.
Connect the BLUE wire on the sensor to
the [W] terminal on the module and to engine/chassis ground (battery
negative () post). NOTE: The [W] terminal on the module does
not need to be connected to anything, but the
blue wire on the proximity sensor must be
Connect the ignition coil negative () terminal to the [C] terminal
on the module. For competition pulling - if the grounding-type killswitch
is used, connect the ungrounded wire from the killswitch to this terminal.
Or for a generator engine, connect this terminal with a semiconductor rectifier
diode to "excite" or temporarily energize the field windings in the
Connect the BROWN wire on the sensor
to the [B] terminal on the module, and to the ignition coil positive
(+) terminal and to the ignition switch (battery positive (+) post).
The cube-shaped proximity sensor has a built-in LED (Light Emitting Diode).
If the proximity sensor is wired correctly, the LED will illuminate when
in close proximity to the detectable target.