Starter
Motor Alternators
The other major electrical component in your car's electrical system
is used only a few times a day but is the single largest power user
and most critical to your car's operation - its starter. The starter
is simply a DC motor that turns the engine crankshaft through the
flywheel, starting the combustion process by creating compression
within the cylinders. Voltage to the starter is supplied directly
from the battery and is controlled by a relay and/or solenoid operated
from the key switch inside your car.
Starters can be of varying types and designs - gear-reduction types
for higher torque, permanent-magnet types to reduce size and weight,
or just plain, old-fashioned heavy starters. But whatever the type,
they all function in the same basic way.
A slow cranking engine may be a sign of a bad starter and with
age, that's more and more likely. But on most cars today, it's due
to low battery voltage, poor electrical connections at the battery
or a failed relay or fusible link.
Most starters will easily outlast a new vehicle warranty if it's
not overused, if good connections are maintained and if it's not
overheated through dirt and grime buildup.
Starting your car with the major components turned off (like the
AC compressor, blower motor and high-powered stereos) will greatly
ease the load on the starter. In fact, most new cars have "lock
out" relays that will not allow the AC compressor and alternator
to turn on until after the vehicle has been started. But turning
these power-hogs off before shutting off your car is always a good
precaution.
Although the starter drive, or "Bendix" as it was commonly
referred to, can be replaced separately from the starter assembly,
it's rarely recommended anymore. Failure of any part is due to age,
usage and heat stress, to which the entire starter has also been
subjected, so that other parts are just as old and stressed. It's
quite common to replace the starter drive only to have to buy another
starter in a few months because the brushes wore out, a magnet broke,
the solenoid failed, among other common mishaps. Replace the starter
as a unit and have the electrical system checked at the same time
to prevent further problems
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