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Old 10-10-2009, 10:28 PM
LPete LPete is offline
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Originally Posted by valkyrie9901 View Post
If you disconnect the battery and the car stalls, the alt is not charging.Won't hurt it unless you short out the + cable........JB.
Actually, disconnecting the battery cable can damage diodes in the alternator. The regulator can't respond instantly to reduce alternator output, so the voltage spikes when the load drops off (possibly well over 100 volts). The diodes aren't designed for that kind of voltage.

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Old 10-11-2009, 08:41 AM
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HJones1313 HJones1313 is offline
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Originally Posted by LPete View Post
Actually, disconnecting the battery cable can damage diodes in the alternator. The regulator can't respond instantly to reduce alternator output, so the voltage spikes when the load drops off (possibly well over 100 volts). The diodes aren't designed for that kind of voltage.
Thats what I understood, just couldn't remember why.

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