I went back and forth on the blue light kits with one of my current customers. they wanted them installed front and back, (rm6095s and sp4000), but they wanted them to shut off when the operator stepped off the truck. I ended up running a 36v relay, off of the line contactor to both units. but you have to run the switching wire as the negative since the line contactor is 36v constant. so here is what I did.

1. split green striped/white wire off of line contactor. send that to coil negative of relay.
2. draw relay coil b+ and light b+ from strobe light suppressor
3. draw lighting b- from one of the access modules master b-.

use b-as the switching circuit. using b+ will cause truck to go into a fault or cause the blue light to turn on when the truck is powered down. ask me how I know. lol