Keystone would have the build sheet with all the appliances model and serial number on it I would think. They should know it left the factory with one.
Perhaps the dealship "borrowed" it to repair another rig and forgot to replace it????
Has been known to happen these last couple of years with parts shortages.
Anyway, here's a diagram of how it should be hooked up.
I believe the standard was a 2000w inverter, which is way more than a fridge would need, I may be wrong. I think there was some internal 120vac receptacles also wired into it. That may be why they used a 2000w inverter.
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