12 VDC AND 24 VDC CIRCUITS DO NOT OPERATE (CONT)

TM 9-2320-366-20-1

e3. 12 VDC AND 24 VDC CIRCUITS DO NOT OPERATE (CONT)

KNOWN INFO

TEST OPTIONS

13.

Continuity Test or

Circuit breaker CB70 OK.

STE/ICE-R Test #91

Battery(ies) OK.

Is continuity present from

REASON FOR QUESTION

Cab to chassis ground strap

terminal lug TL99 to

If continuity is not present,

OK.

terminal lug TL47?

battery to 100 AMP reverse

PDP to cab ground cable OK.

polarity relay 12 VDC cable

Shunt OK.

is faulty. If continuity is

Starter to shunt 24 VDC cable

present, 100 AMP reverse

OK.

polarity relay is faulty.

Battery to shunt cable

assembly OK.

Starter to chassis ground

cable OK.

100 AMP reverse polarity relay

to PDP 12 VDC cable OK.

POSSIBLE PROBLEMS

Faulty 100 AMP reverse

Replace battery to 100 AMP reverse

polarity relay.

YES

polarity relay 12 VDC cable (para 7-74).

Faulty battery to 100 AMP

reverse polarity relay 12 VDC

cable.

Replace 100 AMP reverse polarity relay

(para 7-30).

2-266.22

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