Hudson 1948 - 1952, Service Manual

Page: 145 / 333

ELECTRICAL SYSTEM 6 - 9
The generator armature is carried on a bronze bearing
at the commutator end and on a roller bearing at the
drive end. The bearing should be lubricated with 3 to 5
drops of engine oil at each chassis lubrication. At
generator overhaul the ball bearing should be packed
1/2 full of high temperature non-fibre grease; the
bronze bearing should be soaked in engine oil and the
commutator end grease pocket filled with high temper-
ature grease.
The electrical system is positive grounded and when-
ever a generator is Installed or re-Installed on the en-
gine it should be polarized with the battery to prevent
burning of regulator contact points and damage to the
units.
To polarize the generator, ground the field terminal
to the frame and touch the armature lead briefly to
negative terminal of the battery.
Failure of charging system to maintain the battery
charge under normal operating conditions may be
caused by a faulty condition of the generator, the volt-
age regulator or connecting wires.
WIRING CHECK:
Before removing either the generator or voltage
regulator for overhaul or replacement wiring of the
charging circuit should be checked for high resistance
connections, short or open circuits. These circuits can
be tested by checking the voltage drop between the
connections.
1. Remove the battery lead from the "B" terminal of the
voltage regulator and connect a reliable ammeter
between the terminal and the lead.
2. Run the engine and turn on lights or accessories until
a 10 ampere charge shows on the ammeter.
3. With a 10 volt voltmeter check the voltage reading
between the following points:
MAX. VOLTS
a. Generator frame to battery
ground post .3
b. Battery ground post to
regulator base .3
c. Battery negative post to
regulator "B" terminal .1
d. Generator armature terminal
to regulator "A" terminal .1
e. Generator field terminal
to regulator "F" terminal .5
f. Regulator base to generator frame .3
4. Higher readings indicate frayed or broken wires or poor
connections.
GENERATOR TOTAL OUTPUT CHECK:
1. Disconnect battery lead at voltage regulator "B" terminal; con-
nect the ammeter negative lead to the regulator "B" terminal
and the positive le ad to the wire disconnected from the regula-
tor, Figure 7.
2. Install a jumper from generator field terminal to a ground.
3. Momentarily raise the engine speed to approximately 1250
R.P.M., the reading on the ammeter should read 50 amperes
minimum output.
FIGURE 7
CAUTION: The engine MUST NOT be run for more than a
few seconds while making the above test, due to the danger of
burning out the generator. All lights and accessories must be
turned off during the above test to prevent damage due
to excessive voltage.
NOTE: All generator tests should be made with the generator
circuit at normal operating temperature. If the above test is
made with a resistor type tester, the resistance knob must be
turned to the out position.