Mercury MerCruiser MCM 454 Mag MPI Service Manual page 360

SERVICE MANUAL NUMBER 23
Precautions
The following precautions MUST BE observed when working on the alternator system.
Failure to observe these precautions may result in serious damage to the alternator or
alternator system.
1. DO NOT attempt to polarize the alternator.
2. DO NOT short across or ground any of the terminals on the alternator, except as specifi-
3. NEVER disconnect the alternator output lead or battery cables when the alternator is
4. NEVER disconnect regulator lead from alternator regulator terminal when the alternator
5. ALWAYS remove negative (–) battery cable from battery before working on alternator
6. When installing battery, BE SURE to connect the positive (+) battery cable to the positive
7. If a charger or booster battery is to be used, BE SURE to connect it in parallel with exist-
Batteries
Battery Cables
Select proper size positive (+) and negative (–) battery cables, using chart. Battery should
be located as close to engine as possible.
IMPORTANT: Terminals must be soldered to cable ends to ensure good electrical
contact. Use electrical grade (resin flux) solder only. Do not use acid flux solder as
it may cause corrosion and a subsequent failure.
Up to 3 - 1/2 ft (1.1m)
3-1/2 - 6 ft (1.1-1.8m)
6 ft - 7-1/2 ft (1.8-2.3m)
7-1/2 - 9-1/2 ft (2.3-2.9m)
9-1/2 - 12 ft (2.9-3.7m)
12 - 15 ft (3.7-4.6m)
15 - 19 ft (4.6-5.8m)
Index
90-861326--1 MARCH 1999
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cally instructed in the "Troubleshooting Tests," following.
being driven by the engine.
is being driven by the engine.
system.
(+) battery terminal and the negative (–) (grounded) battery cable to negative (–) battery
terminal.
ing battery (positive to positive; negative to negative).
Cable Length
CHARGING SYSTEM
Cable Gauge
4 (25 mm
2 (35mm
1 (50mm
0 (50mm
00 (70mm
000 (95mm
0000 (120m
2
)
2
)
2
)
2
)
2
)
2
)
2
)
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