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Old 01-18-2015, 07:26 PM
97 SL320 97 SL320 is offline
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Join Date: Jan 2012
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To some extent the battery is a buffer to cover low charging at idle. A smaller pulley will give more charging at idle but the alternator can be damaged at high engine RPM. If you never run to red line a smaller alternator pulley can be a fix.

Thirty amps sounds OK but without another car to compare it to I can't say for sure. If you have an open diode in the bridge charging at low RPM will suffer.

Not all high amp alternators put out more amps at low RPM, some have worse low RPM output than a low amp unit. You need to search for RPM / Amp output curves to be sure.
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