Case 580SR Service Manual page 1017

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8.22 DIFFERENTIAL LOCK SWITCH (1)
At key start the spring loaded switch has 12 V and
when operated energizes the differential solenoid
valve.
Test procedure
(Switch Off)
Continuity should not be found between any pins
(Switch On).
Continuity shoud be found between pins 1 and 5.
Pin No.
1
SECTION 55 - ELECTRICAL SYSTEM
Solenoid Resistance
5.0 Ω
0 V
1: M/B1
5: C-B1
X8
1: RM:CL:1
2: RM:N:1
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