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© 2014 Harmar Mobility, LLC • All Rights Reserved
Troubleshooting
SECTION 2 : INSTALLER
BATTERY
12 V
SHO
P BA
TTERY
APPLY KNOWN GOOD POWER
DIRECT TO MOTOR
APPLY KNOWN GOOD
POWER DIRECT
TO PLUG ON LIFT
OPERATE HAND
CONTROLLER
APPLY KNOWN GOOD
POWER DIRECT
THRU VEHICLE HARNESS
OPERATE HAND
CONTROLLER
DID
MOTOR
RUN
?
DID
MOTOR
RUN
?
DID
MOTOR
RUN
?
YES
YES
YES
NO
NO
NO
REPLACE
MOTOR
INSPECT /
REPLACE
LIFT WIRING
INSPECT or
REPLACE
VEHICLE
HARNESS
SHOP
BATTERY
BATTERY
12 V
WIRING
IN LIFT
WIRIN
G IN
LIFT
CO
M
GREEN
RE
D
RE
D
RED
RED
YELLOW
YELLOW
WHIT
E
BROW
N
SHO P
BATTER
Y
12 V
REPLACE
VEHICLE
BATTERY
PROBLEM
Lift does not operate or lift operates slowly or
intermittently
CAUSE
Bad electrical connection(s) / Circuit breaker
SOLUTION
Check / clean all connections that might be
loose or dirty. This is the #1 cause of a poorly
performing lift. The lifting motor requires
quality electrical connections to operate
at full capacity; any break in the wiring will
slow down the motor and it will deteriorate
prematurely.
Inspect the full length of the wire harness
to ensure the insulation is not torn. The lift’s
vehicle power harness running through or
under the vehicle is subject to road debris and
rubbing against the vehicle’s frame which can
cause a short.
Verify the circuit breaker. The circuit breaker is
located about 6” from the connections to the
vehicle’s battery. The breaker will self-reset if
overloaded; however, verify (with Ohm meter
or test light) that the breaker is functioning.
Or replace it with a new/known-good circuit
breaker and perform the following tests.
CIRCUIT
BREAKER
20 A
SELF
RESETTING
