This alternator carries a spare! Built within the 6-Series alternator is a patented Smart Ready™ internal regulator that's always ready as a primary regulator or as a backup to take over in the unlikely event that your external regulator fails.
The Smart Ready™ internal regulator can be left disconnected, or can be connected to the charging system with a simple, double-throw toggle switch for rapid deployment.
Absolutely useful as an emergency backup, the Smart Ready™ internal regulator also makes it possible for wakeboard and multi-sport trailer boats to enjoy the added charging power of a high-output alternator without the need for external regulation. One year limited warranty.