Sterling Power Pro Protect 12v Alternator Protection Device Overview:

The Pro Protect is a highly effective alternator protection device which prevents high voltage back EMF spike events that can destroy your alternator's expensive regulator and internal diode pack. These events can be caused by:

1. Loose wiring
2. Failure in a split diode/relay charging system
3. Switching off engine electrical power while engine is running
4. Defective rotary battery selector switches
5. Failure of a fuse in alternator's circuit

Any of the above events, and many more, could easily destroy the sensitive components of an alternator; this device will prevent damage from these events by diverting any high spike to ground, and is effective for full-power to no-power fault events. The Pro Protect is designed to absorb/divert spikes in excess of 18v in 12v nominal systems and 36v in 24v nominal systems.

Please note that this device is sacrificial by design: a severe voltage spike may destroy the device; the point is that the spike destroyed the device rather than your alternator.

As with all components that we sell, please carefully observe and follow all installation instructions for this device when installing, as incorrect installation may result in no protection being offered and/or failure of this device or connected components.