Go to your Battery Control Center and look for the 2 small wires coming out of the lower right corner. Those wires are the control wires for you isolator relay. Follow them to the relay.
Also, the relay will be close to both battery banks.
Richard
95 Bounder 32H F53 460
2013 CRV Toad
2 Segways in Toad
First brake job
1941 Hudson