Mid-Continent Instruments and Avionics
Revision D, March 21, 2016
Manual Number 9018205
10
3.4 CABLE
HARNESS
Construct the cable harness following the instructions outlined below and per Tables 4 and 5. Refer to
Section 2: Pre-Installation Considerations for routing precautions.
3.4.1 Wire Gauge Selection
Use of PTFE, ETFE, TFE, Teflon or Tefzel insulated wire is recommended for aircraft use. The wire
harness should utilize 20-24 AWG stranded wire. Refer to Table 4 below for suggested minimum wire size.
Wire Gauge
Wire Length
20 AWG stranded wire
>35 ft.
22 AWG stranded wire
>14 ft.
24 AWG stranded wire
<14 ft.
Table 4
Wire Gauge and Length
Note: Pins should be crimped using Molex Hand Crimp Tool 63819-0000 (preferred), 63811-2800
(obsolete) or 11-01-0200 (obsolete). See the Molex Hand Crimp Tool User Manual for crimp procedures.
3.4.2 Pin Assignment Information
See Table 5 for pinout definition and Figure 2 for pin locations.
Pin Number Signal
1 Aircraft
Power
2 Ground
3
Aircraft Lighting Bus
4
Flight Timer Input
Table 5
Figure 2
Power Input Connector Pinout
MD93 Rear View
3.4.3 Harness
Verification
*** WARNING ***
Failure to install aircraft power and ground wires in the proper mating connector locations could
damage the unit.
Once the cable harness is prepared, prior to connecting the MD93, activate the aircraft power bus
and use a multimeter to verify that aircraft power and ground are supplied with appropriate voltage on
the proper pins within the mating harness.
The MD93 must not be installed with input terminals reversed as this could damage the unit. Verify
the correct polarity of any harness or equipment prior to connecting to the MD93.
