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MicroController Control System Troubleshooting
Problem 27 (continued)
Voltage bellow 11 volts.
Measure the voltage from the (+IN) terminal to (-IN)
terminal of the DC-DC converter.
28.8 volts or above Below 28.7 volts
Remove all connections at the (+OUT) and (-OUT)
terminals of the DC-DC converter. Measure the
voltage from the (+OUT) to (-OUT).
11 to 13 volts Below 11 volts
Check the battery and DC-DC converter
input connections from the battery.
Battery low Poor connection
Check for a short or low resistance
in the auxiliary circuits and loads.
NOTE : Excessive loading places the
converter into current limit
(15A maximum).
DC-DC converter faulty.
Replace converter.
Repair or replace faulty wiring or
connections.
Charge or replace battery.
Voltage above 13 volts.
Remove all connections at the (+OUT) and (-OUT)
terminals of the DC-DC converter. Measure the voltage
from the (+OUT) to (-OUT).
11 to 13 volts Above 13 volts
Check the output load circuits for
incorrect wiring or shorts to battery
negative.
DC-DC converter faulty.
Replace converter.
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