e3. 12 VDC AND 24 VDC CIRCUITS DO NOT OPERATE (CONT)
KNOWN INFO
POSSIBLE PROBLEMS
2.
TEST OPTIONS
REASON FOR QUESTION
Faulty cab to chassis ground
strap.
Faulty PDP to cab ground
cable.
Faulty dashboard cable
assembly.
Faulty shunt.
Faulty starter to shunt 24 VDC
cable.
Faulty battery to shunt cable
assembly.
Faulty starter to chassis
ground cable.
Faulty 100 AMP reverse
polarity relay.
Faulty battery to 100 AMP
reverse polarity relay 12 VDC
cable.
Faulty 100 AMP reverse
polarity relay to PDP 12 VDC
cable.
Faulty 200 AMP reverse
polarity relay.
Faulty 200 AMP terminal
block.
Faulty 200 AMP terminal block
to PDP 12 VDC cable.
Faulty 200 AMP terminal block
to reverse polarity relay 12
VDC load cable.
Faulty 200 AMP terminal block
to reverse polarity relay 12
VDC battery cable.
Faulty battery to 200 AMP
terminal block 12 VDC cable
assembly.
Circuit breakers CB70 OK.
Battery(ies) OK.
Continuity Test or
STE/ICE-R Test #91
This question eliminates
possible problems and
determines where
troubleshooting continues.
Is continuity present from
terminal X3 on power
distribution panel (PDP) to
terminal lug TL64?
NO
YES
Go to step 6 of this fault.
TM 9-2320-365-20-1
2-256 Change 1
