5-5
5
2. Connect the red tester lead to the white/blue (87)
wire and momentarily turn the ignition switch to
the ON position. The meter should read battery
voltage for up to 30 seconds; then drop to zero.
3. Connect the red tester lead to the yellow/orange
(L) wire and turn the ignition switch to the ON
position. The meter should read battery voltage
and the green glow plug indicator should illumi-
nate for up to 30 seconds.
4. Turn the ignition switch off.
5. Turn the ignition switch to the ON position.
Observe the glow plug indicator while momen-
tarily “bumping” the starter button. The glow plug
indicator should immediately extinguish.
6. If steps 2, 3, or 5 are not as specified, replace the
glow plug controller/relay.
7. If the glow plugs remain on for more than 35 sec-
onds, test the ECT switch/thermistor (thermistor
side only).
NOTE: To test the glow plugs, use the following
procedure.
1. Disconnect the white/blue glow plug power wire
from the right-side glow plug; then disconnect the
jumper wire running to the left-side glow plug.
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.
! WARNING
Care should be taken to keep clear of the fan blades.
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