Norton C3120 Owner's Manual page 47

C. Cause for Low Voltage
1. Battery capacity too small.
2. Cable ends not electricity secure to battery cable. (Solder
them if necessary.)
3. Battery cable size too small for load and length of run.
Copper #1 automotive battery cable is the recommended
minimum size. (The wire core diameter of #1 battery cable
is approximately 1/8 inches.) Larger copper battery cable,
#0, or #00 may be required for cable lengths over 16 feet to
keep performance from deteriorating.
4. Ground cable size not equivalent or larger than battery
cable.
5. Bad joints where cable ends are bolted to battery, motor
solenoid, start switch, ground and etc.
6. Burnt contacts on motor solenoid or start switch.
D. Check for low voltage as follows: (Volt meter required.)
1. On engines equipped with an alternator the voltage should
be approximately 13.5 volts with no electrical accessories
operating and the engine running. Check it.
2. Operate pump unit under maximum conditions; this would
be either under full load or when pump is running over relief
(Cylinder dead head). Use the volt meter to probe each
connection, cable end and cable from the battery all the way
back to the motor stud and note the voltage losses. Make
the necessary repairs. Increase the voltage above the
minimum required.
NOTE: Check the ground side as well; paint, rust and dirt
are insulators. Remove them.
E. DC Motors
Motors should be serviced periodically to insure good
performance. Service as follows:
1. Remove head assembly from motor.
2. Check sleeve bearing in head assembly for wear.
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