KNOWN INFO
POSSIBLE PROBLEMS
Is vehicle equipped with a
100 AMP reverse polarity
relay?
TEST OPTIONS
10.
Service drive lights OK.
Circuit breaker CB70 OK.
Batteries OK.
e4. 24 VDC CIRCUITS DO NOT OPERATE (CONT)
Visual Inspection
REASON FOR QUESTION
This question eliminates
possible problems and
determines where to continue
troubleshooting.
Go to step 16 of this fault.
YES
NO
Faulty 100 AMP reverse polarity
relay.
Faulty 100 AMP reverse polarity
relay to power distribution
panel (PDP) 24 VDC cable.
Faulty battery to 100 AMP
reverse polarity relay 24 VDC
cable.
Faulty 200 AMP reverse
polarity relay.
Faulty 200 AMP terminal
block.
Faulty battery to 200 AMP
terminal block 24 VDC cable
assembly.
Faulty 200 AMP terminal block
to reverse polarity relay 24
VDC battery cable.
Faulty 200 AMP terminal block
to reverse polarity relay 24
VDC load cable.
Faulty 200 AMP terminal block
to power distribution panel
(PDP) 24 VDC cable.
TM 9-2320-365-20-1
2-274.2 Change 1