No 800 number or website for information or instructions.
The single line drawing is clear but does not show where to place the fuses or what size they are. Know better what you are doing because there are no instructions in the blueprint. Also, the wire has nothing to say about how big it is.
Pros
VOLTAGE SENSITIVE RELAY. The 140Amp Dual Battery Automatic Circuit Breaker is all you need to charge dual battery systems. The Voltage Sensing Relay (VSR) pulls in at 13.3V and drops out at 12.8V to ensure your main battery is always charged and ready to start your vehicle. It's like having two separate power supplies for each battery and only one alternator.