In a message dated 6/15/99 7:11:07 AM SA Eastern Standard Time,
dresden@tiac.net writes:
> I've always been told that running the engine with the battery disconnected
> will also damage the diodes in the alternator, hence the warnings not to do
> that. Is that the reason, or is that something different, meaning I've once
> again been misinformed...?
>
> Nevin
Disconnecting a battery on an alternator equipped can cause may varied and
interesting problems depending on the car. One of the functions of a battery
is to act like a ballast or electrical shock absorber to prevent voltage
spikes in the electrical system. Also, alternators are capable of producing
some pretty high voltages if allowed to run uncontrolled. Disconnecting the
battery can cause voltage spikes from the ignition system as well as perhaps
as much as 100 volts off the alternator. The two of these together will have
the effect of toasting any semi conductor they come across (diodes in the
alternator for instance) As well as in a new car it can take out various
computers ($$).
The warning about not disconnecting the battery on a running alternator
equipped car are real and to be taken seriously.
Sorry I didn't mention them, I forgot (I"M NOT GETTING OLD I"M NOT I"M NOT!)
Hope this helps,
Rick
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