TP-6774 2/14a90 Section 8 Component Testing and Adjustment
8.16 Continuity Checks
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
To further check generator set components, disconnect
the battery and remove wiring harness plugs from the
ADC IId circuit board. Use an ohmmeter to check the
continuity of the components listed in Figure 8-31. Also
see Section 10, Wiring Diagrams.
Figure 8-31 gives resistance readings for functional
components. A zero reading on the ohmmeter indicates
continuity. No ohmmeter reading indicates very high
resistance or an open circuit. A measurement that
varies significantly from the value shown in the table
indicates a faulty component; replace faulty
components.
Note: Disconnect the generator set battery before
performing continuity checks to prevent damage
to the ohmmeter.
Component
Ohmmeter
Connections
Ohmmeter
Scale
Generator Set
Master Switch
Position
Ohmmeter Readings for Operative
Components*
P1 wiring harness P1 -3 and ground Rx1 OFF Zero ohms (continuity)
Any other reading indicates a poor ground
connection.
P2-6 and P2-7
(stator leads 11 and 44 for
1-phase models)
or
P2-6, P2-7, and P2-8
(stator leads 7, 8, and 9 for
3-phase models)
Rx1 OFF Zero ohms (continuity). If no continuity,
check wiring.
P2-3 and P2-4 (stator leads
55 and 66)
Rx1 OFF Zero ohms (continuity). If no continuity,
check fuse F1 and wiring.
Controller fuse and
wiring
P1-2 and battery positive
(+)
R x 100 OFF Zero ohms (continuity). If no continuity is
found, check fuse F2 and wiring.
Auxiliary winding fuse
10 amp fuse
P2-3 and stator lead 55 R x 100 OFF Zero ohms (continuity). If no continuity is
found, check for an open circuit and/or a
blown fuse.
Low oil pressure (LOP)
sender *
Lead 7 and ground (engine
block)
R x 100 OFF Zero ohms (continuity). No continuity
indicates a bad switch and/or wiring.
Temperature sensor
(CTS) *
P8-1 and P8-2 R x 1000 OFF 180--2500 ohms, depending on engine
temperature. Zero ohms or an open circuit
indicates bad wiring or a bad switch.
Preheat relay
(PH1 and PH2)
Terminals 85 and 86 Rx1 OFF 12-volt relay: 90 ±10 ohms coil resistance
Lower resistance indicates a shorted relay
coil and/or wiring. High resistance indicates
an open relay coil and/or wiring.
* See Section 8.14.2, Fault Shutdown Senders
Figure 8-31 Continuity Checks
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