Dc Electrical System - Westerbeke 90A Four Service Manual

DC ELECTRICAL SYSTEM
12 VOLT DC CONTROL CIRCUIT
The engine has a 12 volt DC electrical control circuit that is
shown on the wiring diagrams that follow. Refer to these dia-
grams when troubleshooting or when servicing the DC elec-
trical system.
A
CAUTION:
To avoid damage to the battery charging
circuit, never shut off the engine battery switch while
the engine is running. Shut off the engine battery switch,
however, to avoid electrical sbarts when working on the
engine's electrical circuit.
BATIERY
The minimum recommended capacity of the battery used in
the engine's 12 volt DC control circuit is 600 - 900 Cold
Cranking Amps (CCA).
Battery Care
Review the manufacturer's recommendations and then estab-
lish a systematic maintenance schedule for your engine's
starting batteries and house batteries.
0
Monitor your voltmeter for proper charging during
engine operation.
0
Check the electrolyte level and specific gravity with a
hydrometer.
0
Use only distilled water to bring electrolytes to a proper
level.
0
Make certain that battery cable connections are clean and
tight to the battery posts (and
to
your engine).
0
Keep your batteries clean and free of corrosion.
A
WARNING:
Sulfuric acid in lead batteries can
cause severe burns on skin and damage clothing. Wear
protective gear.
AIR INTAKE HEATER
The air heater consists of a small heating coil located just
inboard of the air intake silencer housing. The coil heats the
engine intake air. It is wired through the preheat solenoid.
When PREHEAT is pressed at the control panel, this sole-
noid will "click" on and the heating coil will begin to get hot
A
CAUTION:
Do not keep the air heater an for more
than 30 seconds.
No maintenance is required for the air heater.
81
TO WIRING
HARNESS
AIR INTAKE
SILENCER
HOUSING
AIR INTAKE HEATER