XSP310

The XS Power XSP310 Voltage Control Module (VCM) lets you set the charging voltage your alternator puts out instead of living with whatever the factory regulator decided. It controls one alternator at a time and operates across a 10 to 20 volt range, which covers 12V, 14V, and 16V electrical systems.

Dip switch settings do the configuring. On the 12V setting, the module works from roughly 14.2 volts, depending on the alternator, up to a programmed limit of 15.2 volts. On the 14V and 16V setting, the range runs from roughly 14.2 volts up to a programmed limit of 19.5 volts. Those programmed ceilings matter: they keep you inside a defined window rather than guessing with an adjustable pot and hoping nothing cooks.

This is the piece that ties a high-voltage build together. If you have moved to 16V batteries for competition audio, the VCM raises alternator output to actually charge them. If you are running a big 12V system that sags at idle, dialing charging voltage up at the top of the 12V window helps the bank recover between hits. Racing and dyno setups use it the same way to hold consistent voltage under load.

Installation requires an alternator wiring harness matched to your application. XS Power offers harnesses for GM SI series alternators from 1969 to 1988 and GM CS series alternators from 1986 to 1997.