Chapter 3 — Troubleshooting Information
30 Vehicle Power Supply Installation Guide
Identifying and Correcting Problems
Three basic procedures within this chapter identify and correct
most power supply problems you may encounter during
installation. Connector pin-out information is also furnished for
your convenience.
The recommended diagnostic procedures listed below should be
followed in the order given. Troubleshooting charts indicate
when you should use a particular method.
Troubleshooting the Power Supply
Basic diagnostic procedures include the following:
•Inspection
• Electrical (voltage and continuity) measurements
• Component substitution
Inspecting the Power Supply
The power supply has one or two green light-emitting diode
(LED) indicators near the output connector.
The Main Output LED is lit when 12 VDC is present at the
output connector. If you suspect a power failure, check for the
following:
• If the LED is not lit, the power supply is not producing 12
VDC output power. In this case, a fault can exist anywhere in
the system. See the “Troubleshooting Charts” on page 32, to
isolate, identify, and correct the fault.
• If the LED is lit, yet you suspect a power failure, check either
the output cable or further downstream from it.
• If the LED is flickering, the power supply has detected a fault
condition related to temperature, voltage, or current. The
LED will flicker until the problem is resolved. In some cases,
you may have to remove power to reset the power supply.
Inspecting the Cables and Connections
Visually inspect all cable connectors and connections to the
vehicle power source. Correct any obvious faults.
• Use your hands to wiggle cable connectors to ensure they are
not loose or disconnected. Again, correct any faults before
proceeding.
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