For any vehicle that needs to use two batteries where one battery is used for starting the engine. while the other is used to power auxiliary loads. This is a common situation in trucks. boats. RVs. police and rescue vehicles. and in ambulances or fire equipment. A selector switch allows use of the first battery. the second battery. or both batteries simultaneously. This provides back-up starting power in an emergency.

These switches combine the functions of Battery Selector and Master Disconnect Switches to give four battery power options:

• Power cut off at the source
• Power On. Battery 2
• Power On. Battery 1
• Power On. both Batteries

Battery selector switches provide a positive battery disconnect. which has many advantages:

• It gives a reliable shutdown of power during maintenance
• The version with the key protects against theft of the vehicle. when unattended
• It helps protect against electrical fires. when the vehicle is not in use. and minimizes battery drain