My guess is it is a trailer light adapter.  I have one just like it.
Regarding simpler and cheaper to maintain vans,  you might prefer a type
II from the '70's over the Vanagon.

Sean Garrett wrote:
>
> Seeking the wisdom of the list again. I am lacking a manual at this time but
> just sprung for the Bentley yesterday. In my engine compartment on the
> drivers side there is a (aftermarket brand) 2"x4" do-hickey that has cooling
> fins on it. about 4-5 wires come out of it and have been cut and are
> disconnected. Sorry but I can't remember the brand name. What is this?
>
> BTW my van is not parked at my house and its hard to get time to work on it.
> Also it is a salvage yard special that was (is) not running. I am restoring
> it in hope that it will serve me well. We bought a 95 camper in July and I
> fell in live with the VW campers. However my wife drives it and have learned
> that it is a costly SOB to keep maintained. I wanted something simpler in
> design, cheaper, and more ground clearance for Kayaking and Hiking jaunts.

--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext 208

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