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DE494A
2. Select the OHMS position on a suitable tester;
then connect one tester lead to a suitable ground
and the other tester lead to the glow plug center
connector. The meter must read less than 1 ohm.
3. If the meter reading is not as specified, replace the
affected glow plug.
Fan Motor
The connector is the black two-prong one located
behind the fan assembly.
NOTE: The ignition switch must be in the ON
position.
VOLTAGE (Main Harness
Connector to Fan Motor)
1. Set the meter selector to the DC Voltage position.
2. Connect the red tester lead to the black/red wire;
then connect the black tester lead to ground.
3. The meter must show battery voltage.
NOTE: If the meter shows no battery voltage,
troubleshoot the battery, fuse, motor, or the main
wiring harness.
NOTE: If the meter shows battery voltage, the
main wiring harness is good. The connector
should be checked for resistance.
RESISTANCE
(Fan Motor Connector)
1. Set the meter selector to the OHMS position.
2. Connect the red tester lead to the blue wire; then
connect the black tester lead to the black wire.
AR645D
3. The meter must show less than 1 ohm.
NOTE: If the meter shows more than 1 ohm of
resistance, troubleshoot or replace the
switch/component, the connector, or the switch
wiring harness.
NOTE: To determine if the fan motor is good,
connect the blue wire from the fan connector to a
12 volt DC power supply; then connect the black
wire from the fan connector to ground. The fan
should operate.
Fuse Block/Power
Distribution Module
The fuses are located in a power distribution module
under the seat.
If there is any type of electrical system failure, always
check the fuses first.
NOTE: The ignition switch must be in the
LIGHTS position.
1. Remove all fuses from the distribution module.
2. Set the meter selector to the DC Voltage position.
3. Connect the black tester lead to ground.
4. Using the red tester lead, contact each end of the
fuse holder connector terminals individually.
5. The meter must show battery voltage from one
side of the connector terminal ends.
NOTE: Battery voltage will be indicated from
only one side of the fuse holder connector termi-
nal; the other side will show no voltage.
! CAUTION
Always disconnect the battery when performing
resistance tests to avoid damaging the multimeter.
! CAUTION
Care should be taken to keep clear of the fan blades.
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