Installation manual

GEM INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.3
INSIGHT
INSTRUMENT CORP. 15 BOX 122, FORT ERIE, ONTARIO, L2A 5M6
EGT Probe Wiring
The temperature probes must be wired with the correct polarity. The EGT probes connect to the harness wires
with the yellow jacket. The probe leads and harness wires are color coded (red and yellow) to facilitate correct
polarity. Each wire is marked with the cylinder number.
Slide the wire marker down the wire so it remains with the installation for trouble-shooting. Strip the wires ac-
cording to Drawing No. 8254 and terminate with the crimp-on terminals (provided).
Verify the quality of each crimp with a “sharp” pull on the wire. The terminal should be almost impossible to pull
off when crimped correctly. Harness and probe wire colors should match as in Drawing No. 8254.
NOTE: The ring terminals may be crimped with a “service type” tool, however, AMP part number #47386 is
recommended. Be sure to test each crimp by pulling on the wire to ensure it won’t come out. The most
common installation problems are the result of poor quality termination.
CHT Probe Wiring
The CHT temperature probes must be wired with the correct polarity. The CHT probes connect to the harness
wires with the black jacket. The probe leads and harness wires are color coded (red and white) to facilitate
correct polarity. Each wire is marked with the cylinder number.
Slide the wire marker down the wire so it remains with the installation for trouble-shooting. Strip the wires ac-
cording to Drawing No. 8254.
Terminate with the crimp-on ring terminals provided. Verify the quality of each crimp with a “sharp” pull on the
wire. The terminal should be almost impossible to pull off when crimped correctly.
Harness and probe wire colors should match according to Drawing No. 8254. Insulate and bundle as
discussed below.
Routing the Wiring Harness
It is essential to match the cylinder numbers on all the probes to display the proper information to the pilot.
The probe/harness connections should be insulated with the high temperature fiberglass sleeves provided and
routed away from high temperature areas, e.g. exhaust stacks, turbochargers, etc.
The probe wires must not be tied in with ignition, alternator or cabin heater ignition wires because of potential
errors in temperature readings.
All wires should be bundled and tied with nylon wire ties or lacing cord and attached to the airframe to prevent
damage from vibration and wind buffeting.
The probe wiring harnesses are made of special alloy wire that must not be substituted or extended with cop-
per wire.
The power and ground wires are copper and may be extended if necessary.
When the installation is complete all wires should be secured using wire ties and carefully checked for
interference, rubbing or chafing with flight control cables, or other moving parts.