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The house disconnect is turned off
Turn on the house disconnect
Blown fuses
Verify the 10A and 3A fuses are not blown and seated
correctly. NOTE: some units may be built with the 3A
fuse as part of the fuse panel.
The alternator regulator has a fault
* The LED on the regulator is red or flashing red
Count the flashes and compare to the fault table
located in the APS-500 Alternator Regulator section.
The battery has a fault
* Observe the battery screen (Samkoon) for any fault
information
* Correct any faults
The regulator isn't communicating
with the battery
The LED on the regulator may be green in color
Check RV-C wiring connections and verify network
termination resistance is ~60Ω
No 12V power supply to the
regulator
* Measure voltage from pin 20 to pin 4, should be ~12V
* No voltage indicates a blown fuse or battery
No 48V power supply to the
regulator
* Measure voltage from pin 8 to pin 4, should be ~48-
54V
* No voltage indicates a blown fuse
Field circuit to alternator shorted to
ground or open
Measure resistance from pin 6 to pin 4, should be
~45Ω; lower is a short circuit, higher is an open circuit
The regulator may be defective
* Likely caused by R&R regulator while 48V battery
power is ON.
* Indicated by the LED on the regulator never turning
ON.
* Replace the regulator
The A/C doesn't
work at all
Problem with 48V wiring at the A/C
* Check connections at the A/C, ensure it has blue twist
caps or gray Anderson connector
* Perform TSB 22-075, if not done already
No 48V power supply to the A/C
Remove the inside cover and measure voltage at the
A/C, should have battery voltage (~48-54V)
Inspect fuse
If fuse is blown measure resistance of power wire to
ground to ensure no short circuit, then replace fuse
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