Charging System/Alternator - Service Information - Honda Nighthawk CB 750 1991 Service Manual

13. Charging System/Alternator
Service Information 13-1 Charging System Inspection 13-5
System Location
13-2
R e g u l a t o r I R e c t i f i e r
13-6
Troubleshooting 13-3
A l t e r n a t o r
13-7
Battery
R e m o v a l / l n s t a l l a t i o n
13-4 Alternator
R e m o v a l l l n s t a l l a t i o n
13-8
Service Information
The battery gives off explosive gases
;
keep sparks, frames, and cigarettes away. Provide adequate ventilation
when chariging or using the battery i n an enclosed space.
The banery contains sulfuric acid (electrolyte). Contact w i t h skin or eyes may cause severe burns. Weal
protective clothing and a face shield.
-If electrolyte gets on your skin, flush with water.
-If electrolyte gets in your eyes, flush with water for a t least
15
minutes and call a physician immediately.
Electrolyte is poisonous. If swallowed, drink large quantities of water or milk and follow w i t h milk of magnesia
or vegetable oil and call a physician.
KEEP OUT OF REACH OF CHILDREN.
For alternator shaft assembly removallinstallation, refer to section 9.
-
Always turn off the ignition switch before disconnecting any electrical component
CAUTION
Some electrical components may be damaged if terminals or connectors are connected or disconnected while the
ignition switch is O N and current is present.
For extended storage, remove the battery, give it a full charge, and store it in a cool, dry space. For maximum service
life, charge the stored battery every two weeks.
For a battery remaining in a stored motorcycle, disconnect the negative battery cable from the battery terminal.
NOTE
.
Refer to Section 2 2 of the Common Service Manual and the instructions in the Operation Manual for the HONDA
Battew Tester and Christie Batterv Charaer for detailed batterv charaina stew.
The battery can be damaged if over charged or undercharged, or of left to discharge for long periods. These same
conditions contribute to shortening the "life span" of the battery. Even under normal use. the performance of the battery
deteriorates after 2-3 years.
Battery voltage may recover after battery charging, but under heavy load, battery voltage will drop quickly and eventually
die out. For this reason, the charging system is often suspected to be the problem. Battery overcharge often results from
problems in the battery itself, which may appear to be an overcharge symptom. If one of the battery cells is shorted and
battery voltage does not increase. the regulatorlrectifier supplines excess voltage to the battery. Under these conditions.
the electrolyte level goes down quickly.
Before troubleshooting the charging system, check for proper use and maintenance of the battery. Check if the battery
is frequently under heavy load, such as having the headlight and taillight ON for long periods of time without riding the
motorcycle
.
The battery will self-discharge when the motorcycle is not is use. For this reason, charge the battery every two weeks
to prevent sulfation from forming. -
Filling a new battery with electrolyte will produce some voltage. but in order to achieve its maximum performance, always
charge the battery. Also, the battery life is lengthened when it is initial-charged
When checking the charging system, always follow the steps in the troubleshooting flow chart (page 13-3).
-
For battery testinglcharging, refer to section 2 2 of the Common Service Manual.
For charging system component locations. see page 13-2.