Probably this question is better suited for the motor home channel however I will give it go here . I am trying to understand the purpose of a latching relay and then another solenoid (relay) to contr...
There are many ways to use relays. A typical latching set up uses one relay to close a second relay. The second relay uses one of its contacts to feed power to its coil so it stays latched. This is old technology, many of today's relays are controlled by board mounted solid state devices.
Trying to determine the circuitry is part of the adventure for any electrical trouble shooting.