Perko 8503DP Medium Duty Battery Selector Switch with Alternator Field Disconnect

The Perko 8503DP is a medium-duty battery selector switch designed for marine and RV electrical systems with two or more batteries and single or dual engine configurations. This versatile switch allows you to select between individual batteries for starting and charging, or operate both batteries in parallel for increased capacity.

Key Features:

• Medium-duty construction for reliable performance in demanding marine environments
• Integrated alternator field disconnect (AFD) protects alternator from voltage spikes during switching
• Four-position rotary switch: OFF, Battery 1, BOTH, Battery 2
• Enables use of dedicated starting battery while reserving second battery for accessory loads
• Allows parallel operation of both batteries for heavy electrical demands
• Suitable for single or dual engine installations
• Heavy-duty contacts for dependable switching under load

The alternator field disconnect feature is essential for safely switching between batteries while the engine is running, preventing damage to the alternator and other electrical components. This switch provides flexible battery management for boats, RVs, and other applications requiring reliable multi-battery control.