Harmar Mobility AL003, Installation & Service Manual

Page: 29 / 36

Outside Vehicle Lifts: Installation & Service Manual
06DEC19 | P/N: 630-00106 REV A
29
OUTSIDE VEHICLE LIFTS: SECTION 7
TROUBLESHOOTING
Section 7
Troubleshooting
The following procedures are reserved for the
approved installer/dealer. Do not attempt these
procedures without the proper knowledge of the
automotive electrical circuitry.
1. Be careful when troubleshooting with the
voltage meter. The instruments will detect
voltage but may not indicate a tear or poor
connection in the wiring. An instrument may
give a false reading since it will only indicate
that there is some wire connection, but this wire
connection may not necessarily be sufficient.
See Figure 7-1.
Figure 7-1
2. Examine both voltage and current. As an
alternative, isolate sections of the lift wiring
using the process of elimination with a known-
good/fully charged 12V automotive battery or a
known-good/fully charged power chair/scooter
battery.
3. Inspect the full length of the wiring harness to
ensure the insulation is not torn. The lift’s vehicle
power harness running through or under the
vehicle is subject to a possible short from road
debris rubbing against the vehicle’s frame.
4. Verify the functionality of 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, use an
ohmmeter or test light to verify that the breaker
is functioning or replace the circuit breaker
with a new or known-good circuit breaker and
perform the following tests.
Lights Up
No Light
Lights Up
Motor
Dead
Insulation
Removed for
Clarity
Exaggerated
Tear or Chaff
Open
Motor
Runs
Motor
Dead
Insulation
Removed for
Clarity
12V Reading
12V Reading
0V Reading