Alternator Regulators

An external smart regulator controls how your alternator charges, using a multi-stage profile matched to your battery chemistry instead of the fixed voltage of a stock internal regulator. This collection includes Balmar MC-614 and MC-618 Max Charge regulators and the ARS-5 (with or without harness), Sterling Power alternator-to-battery chargers from 100A to 400A in 12V and 24V, and Powerline and Aqualine regulators.

How to choose an alternator regulator

• Alternator type: external regulators need an alternator with an external field connection (P-type or N-type).
• Battery chemistry: pick a regulator with profiles for AGM, gel, flooded or lithium.
• Voltage: 12V or 24V to match your system.
• Sensors: battery and alternator temperature sensors improve charging and protect the alternator.

Regulator or alternator-to-battery charger?

A regulator controls the alternator field directly. A Sterling alternator-to-battery charger sits between the alternator and the house bank and works with the stock alternator. See our alternator and regulator guide.

Do I need a new alternator too?

Not always. If your stock unit is small, consider a high-output marine alternator.