• Check battery voltage.
  • Check switch on fixture or on Wall. Check all connections for a bad contact. Make sure all wiring & connections are secure.
  • Check the line (battery) side of the wiring. Make sure that power is being supplied to the fixture.
  • Replace or check all lamps to ensure satisfactory operation.
  • As lamps are removed, examine all sockets to ensure they are not damaged or broken and are making proper and positive contact with the lamps. Make sure all lamp sockets are seated properly into sockets.
  • Examine all electrical connection within the fixture, including at the lamp sockets, to ensure conformance with the wiring diagram on the ballast. If it still will not light, check the voltage at the light.
  • Recommended operating voltage is between 11 and 14 VDC. Voltage drop due to loose connections at 12V fused distribution panels is not uncommon in mobile applications.
  • Adjust torque where needed. Improperly tightened fasteners may reduce voltage delivered to 12V lights and accessories.
  • If one or more light fixtures are controlled by a wall switch verify that it is a DC rated switch. The “DC Rule of Thumb” is “a switch that is rated at 15A 125VAC will likely perform satisfactorily at 15 amps 12VDC.”
  • Contacts on a non-DC rated switch may become corroded. This increases resistance and reduces voltage levels.
  • Check voltage at all wall switches and replace if defective or voltage reading is below 12VDC. Check all connecting points on the 12VDC wiring harness for corrosion. Clean as needed.
  • If there is no voltage at the light, check the wire to make sure they are connected. Black wire is positive (+) and white wire is negative (-). Fixtures are protected against reversed polarity. If improperly connected, the fixture will simply not turn “on”. If the wires are connected properly, and there is still no voltage to the light, check voltage at battery and fuse box.