Western Snowplows Midweight Series, Mechanic'S Manual

Page: 98 / 104

Lit. No. 48163, Rev. 00 March 15, 2016
98
TROUBLESHOOTING
MOTOR AND MOTOR RELAY TEST – Snowplows with FLEET FLEX Electrical System
WARNING
Keep 8' clear of the blade when it is being
raised, lowered or angled. Do not stand
between vehicle and blade or directly in
front of the blade. If the blade hits or drops
on you, you could be seriously injured.
For snowplows
not
equipped with the FLEET FLEX
electrical system, follow the Motor and Motor Relay
Tests instructions beginning on p. 93.
Perform this test if the control lights up and turns
ON, but the motor does not run when any function
but LOWER is selected.
1. Check the F2 fuse* on harness B. Replace if
fuse is blown, then retest snowplow function.
2. Remove the 8" red battery cable from the
large terminal of the motor relay and isolate it.
Isolating the cable will eliminate the possibility
of accidental blade movement during testing.
3. Check for 12V at the small terminal of the
motor relay with the red wire attached to it. If
12V is not present, recheck the coil fuse F2 in
harness B. If the fuse is good, check the red
wire and harness B. Replace/repair either the
wire or the harness as needed.
4. If 12V is present at the small relay terminal with
the red wire, turn the control ON, then check
for switched ground on the small terminal with
the black wire attached to it while activating
any function except LOWER. If switched
ground is not present, check the black wire and
harness B of the plow module. Replace/repair
either the wire or the harness as needed.
5. Check for switched 12V at the empty large
motor relay terminal while activating any
control function except LOWER. The empty
terminal is the terminal that would normally
* See wire stamping for fuse identification.
connect the 8" red battery cable. If switched
12V is not present, replace the motor relay.
6. If switched 12V is present at the empty large
motor relay terminal, replace the motor.
7. Once testing is complete, reinstall the 8" red
battery cable, then recheck the snowplow
functions.
Harness B
Harness A
Plow Module
Plow
Battery
Cable
Intermittent-Duty
Motor Relay
8" Small
Battery
Cable
Small
Motor Relay
Terminals
S1
+
S2
Harness
B
S3