Chance,
The Axis/Vegas units have a "normal" parasitic load about 10 times greater than what you would see in your cars. This is what routinely kills the chassis batteries. So far, none of have been able to figure out where it comes from. Breaking the circuit with a switch or providing a trickle charge solves the problem.
I'm pretty sure it is something that Thor adds. If it were a "feature" of the E350/450 platform we'd have heard about it.
Regards,
Randy
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