Where's the battery isolation manager (BIM) on a newer Jayco Melbourne?

[bluztoo]

Before I go out and dive in, I've seen two different ideas - under the front seat of the Mercedes or on the firewall. Trying to configure my dc to dc charger. I know that it can either be a solenoid (not the one to shut off the coach power) or a green circuit board color device. Appreciate help from anyone who's gone there before me!