Boss Snowplow MSC08042C Owner's Manual page 87

Troubleshooting Guide
PROBLEM
3. Plow will not lower.
DIAGNOSTIC CHECK
Check power/ground cables
and control cables are
connected properly.
Check flow control valve.
Check wiring on valve block
for proper connections.
Check for voltage between
solenoid valve terminal and
ground with ignition switch
on and control switch in
FLOAT position.
Test power to the control box
by checking voltage between
black wire and ground at the
white 9-pin connector.
88
RESULT
Connect.
If flow control valve is
completely closed, place
RAISE/LOWER switch in
NEUTRAL, then open the flow
control valve.
Refer to the wiring diagram in
your Installation manual.
If voltage is present solenoid
valve or valve coil has failed.
Replace valve or valve coil.
If NO voltage is present,
power from relays has become
disconnected. If voltage is
present, check wiring and
switch of controller.