TEST OPTIONS
REASON FOR QUESTION
e4. 24 VDC CIRCUITS DO NOT OPERATE (CONT)
Continuity Test or
STE/ICE-R Test #91
21.
KNOWN INFO
Service drive lights OK.
Circuit breaker CB70 OK.
Batteries OK.
200 AMP terminal block OK.
Battery to 200 AMP terminal
block 24 VDC cable assembly
OK.
200 AMP terminal block
to reverse polarity relay 24
VDC battery cable OK.
Faulty 200 AMP terminal block
to reverse polarity relay 24
VDC load cable.
POSSIBLE PROBLEMS
Faulty 200 AMP reverse
polarity relay.
Faulty 200 AMP terminal block
to power distribution panel
(PDP) 24 VDC cable.
Is continuity present from
terminal X1 on PDP to
terminal lug TL44?
NO
YES
Replace 200 AMP reverse
polarity relay (para 20-58).
Replace 200 AMP terminal block to
PDP 24 VDC cable (para 20-68).
If continuity is not present,
200 MAP terminal block to
PDP 24 VDC cable is faulty. If
continuity is present, 200 AMP
reverse polarity relay is faulty.
TM 9-2320-365-20-1
2-274.24 Change 1
