Hudson 1948 - 1952, Service Manual

Page: 141 / 333

ELECTRICAL SYSTEM 6 - 5
a heavy shunt across the terminals. With the cell tester the
difference between cells should not be more than .15 volts,
and each cell should test at least 1.5 volts. With the Battery-
Starter Tester, meter should show at least 4 volts at 300
amperes discharge.
If a tester is not available, a voltmeter may be connected
across the battery terminals while engine is cranked with
the starter motor. Battery is serviceable if the starter cranks
the engine at a good speed for 1/2 minute and the voltage
does not fall below 4-1/2 volts. DO NOT CRANK MORE
THAN 1/2 MINUTE WITHOUT ALLOWING
STARTER MOTOR TO COOL.
A slow cranking speed or voltage lower than 4-1/2
indicates a weak cell or high resistance in the connections
to the starter, and the battery cables should be checked and
load test repeated.
BATTERY CABLE CHECK:
1. Connect a negative voltmeter lead to the negative battery
terminal and the positive lead to the starter motor termi-
nal. Crank the motor with the starter. Voltage should not
exceed .2 volts.
2. Connect the positive voltmeter lead to the battery ground
post and connect the negative lead to car frame. Crank
the motor with the starter. Voltage should not exceed .2
volts.
3. Connect positive voltmeter lead to car frame and nega-
tive lead to starter motor frame. Crank the motor with
the starter. Voltage should not exceed .2 volts.
4. If voltage loss is greater than above, terminal posts,
ground strap and connections,
and starter solenoid should be checked for
high resistance.
STARTING MOTOR
The starting motor is activated through a solenoid switch
mounted on left hand front fender side dust shield. The
solenoid is controlled by a push button on the instrument
panel. Operation of the solenoid closes the circuit from the
battery to the starting motor. The solenoid may be manu-
ally operated by removing the threaded cap on the rear of
the solenoid cover and pushing the exposed plunger. The
instrument panel push button will operate the solenoid only
when the ignition switch is turned on.
Bearings on the starting motor are lifetime lubricated and
require no oiling.
The starting motor cranks the engine through a left hand
inboard type Bendix drive mounted on the armature shaft
on cars not equipped with the Hydra-Matic Drive. Cars
using the Hydra-Matic Drive use a right hand outboard
Bendix.
FIGURE 3
CRANKING VOLTAGE TEST:
1. Connect the negative voltmeter lead of the starter motor
tester to the starter switch terminal, Figure 3.
2. Connect the positive voltmeter lead to engine