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Coilpack wiring harness
Colors/function
Red supplies coilpack 12 volt power, black supplies ground, other wires are the
spark signals from the ecu cpu chips. Signal wires are orange, white, blue(6&8cyl),
gray(8cyl only).
When you unpack the system, these wires will not yet be installed into the coilpack
harness 12 position ecu white connector. These wires will usually be 4 to 10ft in
length and they need to be pushed through the firewall from the engine bay side of
the aircraft, and routed to the CPi2 ecu. Route these in to verify they are long
enough and then you can insert the end terminals into the white 12pin connector
as shown here in the photo. Be careful the terminals won’t come out without an
extractor tool! When inserting terminals, crimp folds must be toward the top of
connector and top is where the latch is.
Single board CPi2 driving two coilpacks, the upper row will also get the same wires
from the second coil pack. Not applicable to 8cyl, only 4&6 cyl.
Dual Board CPi2 driving two coilpacks will look like the photo on both boards.
Please don’t cut and install a connector at the firewall, this just adds another point
of stress/failure.
Coil pack mounting
For common Lycoming and Continental installations refer to supplement manuals to mount coil packs.
Generic mounting: Both types of coilpacks pictured on the front page of the manual are able to be mounted on the
engine if needed. Do not mount coil packs within 8 inches of exhaust pipes. Shield coilpacks from infrared exhaust
heat also.
Hall sensor cable(s) and ecu connector
From engine bay, route through the firewall to the gold CPi2 ecu. Do not route
hall sensor cable alongside spark plug wires. Keep away from spark plug wires
by at least 2 inches. Keep away from hot exhaust pipes, and shield with fire
sleeve if necessary to reflect infrared from exhaust. Use a grommet at the
firewall and please don’t cut and install a firewall connector, this just adds
another point of stress/failure. Route to the CPi2 ecu and insert the terminals
into the white 4-position connector as shown in the photo.
Important:
Dual board ecu’s will use a dual hall sensor with 2 cables, marked as follows:
The Green hall cable will connect to the “A” Primary ecu closest to the lid.
The Red hall cable will connect to the “B” Backup ecu closest to the mounting flange.
A note about cutting off crimped on terminals
If you have a small excess of wire its much better to loop the extra length vs cutting and crimping on new pins.
We use a $350 crimp tool and other crimpers don’t do the best job. Universal crimper Molex # 0638111000 is okay
but you have to trim the insulation tabs of the terminals about halfway before crimping. The conductor part of the
terminal will crimp good enough using the smallest opening at the tip of the crimp tool. For the above universal
crimper, enter molex part number 0638111000 into Octopart.com to see who has stock and best pricing. Also good
idea to use a short piece of 1/16” heatshrink on each wire of the multi conductor tefzel cables. Put heatshrink just
before crimping on a molex terminal, this helps protect the wire from breaking. Soldering is actually a good option if
crimping is not possible.
