Master Battery Switch; Alternator, Engine Mounted; Electrical Starter; Wire Runs - Tayana 37 Operation & Maintenance Manual

b. Master Battery Switch
All TAYANA Yachts come with a two position battery switch. This
switch allows you to put one battery at a time into the circuit or to use
both batteries at once. It is a make before break switch so one can select
batteries at will while the engine is running; however, you must not put
the switch on "off" with the engine on as damage to the alternator may
result. There is little that the owner can do to maintain the master battery
switch other than to keep it clean.
c. Alternator, Engine Mounted
A critical point in the DC electrical system is the alternator. It's job is to
maintain the battery's charge and cover the demands on the electrical
system while the engine is running. The alternator converts mechanical
energy into electrical energy, and the drive belt is its only link. This is
normally the only periodic attention the alternator needs, maintenance-
wise. With the engine stopped, the drive pulley on the alternator should
not be able to be turned by hand. Belt tension may seem tight enough,
but the pulley may still slip if the belt is glazed or oily. When checking
or tightening the alternator and its connections, it is advisable to turn off
the battery switch. This prevents accidental "shorting" of the output
terminal which is "live" even when the engine is at rest.
d. Electrical Starter
The engine starter motor is the most demanding load that will be placed
on the electrical system and is not fused or protected by an overload
device. Therefore, it is wise to make periodic checks on the connections
at the starter and solenoid switch for tightness and cleanliness. Do not
allow tools or other metal objects to come into contact with these
connections while the battery is "on".
e. Wire Runs
Wiring in your yacht is generally carried through wiring conduits. These
conduits protect the wires from wear or impact. The color code used is
shown in Table V-1. Where wiring is exposed, it should be checked to
see that it is clear of potential harm. Terminal blocks and other exposed
wire termination points should be sprayed with WD40 or some similar
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