Motor Solenoid Switch; Battery Gravity - Hudson 480-490 Series Service Manual

480-490 series
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92 BODY MANUAL
retaining nut on the instrument panel. See Figure 149.
The pump motor should operate when the top operating
knob is pulled out or pushed in. If motor fails to operate,
use the test lamp to check whether current is reaching the
switch. Current is carried to a terminal on the face of the
switch from the "AUX" terminal on the circuit breaker. If
current is reaching the switch, failure of the test lamp to
light from the side terminal. when the top operating knob
is pulled in or pushed out indicates that the switch is
inoperative and should be replaced.

MOTOR SOLENOID SWITCH

CHECK
If the foregoing tests indicate correct battery gravity, and
if window and top operating switches operate satisfactori-
ly, but motor fails to operate, it will be necessary to
remove the rear seat cushion and rear seat back to gain
access to the well containing the Hydro-Lectric unit.
Check the connections from the battery to the solenoid
switch and from the solenoid to the motor.
FIGURE 149
Current should reach the switch (center) terminal of the
motor solenoid when window switches are moved up or
top control knob is moved in or out. A distinct "click" will
be heard if solenoid is operating satisfactorily.
If current does not reach the switch terminal, wires from
the window and top operating switches should be checked
for open or short circuit. Operation of the solenoid may be
checked by disconnecting the wires from the switch termi-
nal and connecting a jumper from the battery terminal to
the switch terminal. If solenoid is satisfactory, the sole-
noid will "click", and the motor will operate. If no click is
heard with the jumper in place, the solenoid switch should
be replaced.
WINDOW POWER VALVE
SOLENOID CHECK
In normal operation the window power valve solenoid
should make a distinct "click" when the window control
switch knob is moved up or down. If this click is not
heard, check the window control switch.

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480 series490 series

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