CHARGING AND STARTING SYSTEM
Page 2B-8 90-828631R3 MARCH 1999
Battery
Recommended Battery
A 12 volt battery with a minimum rating of 465 marine cranking amps (MCA) or 350 cold
cranking amps (CCA). For operation below 32° F (0° C) a rating of 1000 Marine Cranking
Amps (MCA) or 775 Cold Cranking Amps (CCA) is recommended.
Operating Engine Without Battery
If desired (or in an emergency), engines equipped with an electric start and alternator can
be started and operated without a battery (either disconnected or removed) if “WARNING”,
below, is followed.
WARNING
Before operating engine with battery leads disconnected from battery, disconnect
the three wire (stator harness plug) from rectifier.
Battery Charging System Troubleshooting
CAUTION
The charging system may be damaged by: 1) reversed battery cables, 2) running the
engine with battery cables disconnected and stator leads connected to rectifier,
and 3) an open circuit, such as a broken wire or loose connection.
A fault in the battery charging system usually will cause the battery to become under-
charged. Check battery electrolyte level, and charge battery. See “Electrolyte Level”, and
“Charging a Discharged Battery”.
If battery will NOT accept a satisfactory charge, replace battery.
If battery accepts a satisfactory charge, determine the cause of the charging system prob-
lem as follows.
1. Check for correct battery polarity [RED cable to POSITIVE (+) battery terminal]. If polar-
ity was incorrect, check for damaged rectifier. See “RECTIFIER TEST/REGULATOR
DIODE TEST”.
2. Check for loose or corroded battery connections.
3. Visually inspect wiring between stator and battery for cuts, chafing; and disconnected,
loose or corroded connection.
4. Excessive electrical load (from too many accessories) will cause battery to run down.
If visual inspection determines that battery connections and wiring are OK, perform the fol-
lowing stator and rectifier tests.
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