Chapter 3 — Troubleshooting Information
32 Vehicle Power Supply Installation Guide
Using Component Substitution
Component substitution is the most expedient and certain
troubleshooting technique.This is especially valuable when trying
to resolve intermittent problems.
• Use the guidelines in the following troubleshooting charts,
substituting only when directed to do so.
• If an installation suffers intermittent input power fuse failures,
or if the power supply shuts down without good cause, do not
hesitate to substitute a known good power supply.
• The disadvantage of component substitution is that you must
either have spare parts (power supply and both cables in this
instance) or be prepared to take components from another
working installation.
Troubleshooting Charts
The following troubleshooting chart assumes that your vehicle
mount computer or other equipment does not work and that the
problem is caused by the power supply or its associated cables
Power Supply Reset
Where the troubleshooting chart instructs you to “reset the power
supply,” you must disconnect the input power cable for 10
seconds, then reconnect it. The power supply has automatic over-
voltage, over-current, over-temperature, and short-circuit
protection. If the problem persists, the LEDs will continue to
flicker. Disable input power when these faults activate that
protection.
Power Supply Troubleshooting
Follow the procedures in the tables in the order they are shown
for maximum efficiency.
Troubleshooting - Main Output LED
LED Meaning Remedy
Lit Power supply is working Test for proper vehicle supply
voltage at source
Not lit No output from power
supply
Disconnect input power cable
to reset power supply
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