JLG sky trak mmv Service Manual page 626

Electrical System
b. Travel Select Lever and Wiring Harness Testing
Note: An assistant will be required to be seated and
operate the travel select lever in order to perform the fol-
lowing test.
1. Remove the plug from the UPPER (1 and 3) and
LOWER (2 and 8) transmission solenoid valve
bodies. Turn the ignition switch to the RUN position.
2
7
4
10.146
1
MT2280
5
6
3
MT1110
Note: In order to perform the solenoid test, the Parking
Brake Switch must be in the OFF position.
2. Have an assistant place the travel select lever in the
position that is not functioning correctly.
Note: Only use a DMM with 10 megohm impedance to
prevent damage to the dash panel board.
3. Check the harness side pin connections with a DMM
for battery voltage corresponding to the direction
and gear that has been selected. Refer to the chart
that follows. Place the negative (-) lead on pin 7
(ground) (4 or 9) and the positive (+) lead on the pin
to be tested, and test for battery voltage. If battery
voltage is not present on any of the pins that have
been tested, the wiring harness is suspect and
should be replaced. If battery voltage is present, the
harness is functioning properly.
12
9
10
8
11
MT1120
Model MMV Rev. 12-04