TP-6735 7/17 85Section 5 Component Testing and Adjustment
5.13 Continuity Checks
Hazardous voltage. Moving parts.
Will cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
DANGER
Short circuits. Hazardous voltage/current will 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
controller circuit board. Use an ohmmeter to check the
continuity of the components listed in Figure 5-39. Also
see Section 7, Wiring Diagrams.
Figure 5-39 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.
For rotor and stator resistance and continuity checks,
see Section 5.3, Stator, and Section 5.4, Main Field
(Rotor).
Component
Ohmmeter
Connections
Ohmmeter
Scale
Generator Set
State
Ohmmeter Readings for Operative
Components
P1 wiring harness P1-2 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)
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
P1-1 and battery positive
(+)
R x 100 OFF Zero ohms (continuity). If no
continuity is found, check fuse F3 and
wiring.
Auxiliary winding breaker
(20-amps)
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)
switch *
Lead 13 and ground
(engine block)
R x 100 OFF Zero ohms (continuity). No continuity
indicates a faulty switch and/or wiring.
Temperature sensor
(CTS) *
P1-9 and P1-10 R x 1000 OFF 180--2500 ohms, depending on
engine temperature. See
Section 5.10.2. Zero ohms or an
open circuit indicates faulty wiring or
a faulty switch.
Magnetic pickup QCON1 and QCON2 R x 1000 OFF 1.6 kohms. Zero ohms or an open
circuit indicates a faulty pickup;
replace the magnetic pickup.
* See Section 5.10.2, Fault Shutdown Switches
Figure 5-39 Continuity Checks
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