5· 8 Battery - Yamaha JT1 Series Service Manual

ELECTRICAL SYSTEM-Spark Plug, Lighting and Signal Systems
a. Checking the Silicon Rectifier
For measurements, as ohmmeter can be used.
(Set the tester on "Resistance.")
Checking with Normal Connection
Checking with
normal connection
Fig. 5-7-2
Connect the tester's red lead
(+}
to the silicon rectifier's red terminal, and connect the
tester's black lead H to the rectifier's white terminal.
Standard value: 9-10D
If the tester's pointer will not swing back from the over scale, the
rectifier is defective.
Checking with Reversal Connection
Connect the tester the other way round.
Standard value:
If the pointer will not swing, the rectifier is in good condition. If the
pointer swings, the rectifier is faulty.
3. Operational Note
The silicon rectifier can be damaged if subjected to overcharging. Special care should be
taken to avoid a short circuit and or incorrect connection of the positive and negative leads
at the battery. Never connect the rectifier directly to the battery to make a continuity
check.
5-8 Battery - JT2
The battery is a 6 volt-2 AH unit that is the power source for the horn and stoplight. Because
of the fluctuating charging rate due to the differences in engine R.P.M.s, the battery will lose
its charge if the horn and stoplight are excessively used. The charging of the battery begins at
about 2,500 R.P.M. Therefore, .it is recommended to sustain engine R.P.M.s at about 2,500 to
3,500 R.P.M. to keep the battery charged properly.
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