There is 3 steps to the newest wiring for the Orion BMS system installed in the Ranger EV

You need 2 single pole relays with 12V coils and a normally open set of contacts

you need a complete Orion kit with 500 amp counter with system .....................................

Below is the 3 steps I now use to install these wonderful kits in the trucks 

Orion BMS latest Wiring updates and schematics