Go to yur FLAPS (friendly local auto parts store) and tell them your problem.  They sell an
adaptor gizmo for $10 or $15, and it works just fine.  This problem is not unique to Vanagons.

Bill

----- Original Message -----
From: "Thomas Ryan" <Tnmryan@AOL.COM>
>
> I wish to tow a trailer wired with two taillights and four wires leading to
> the hitch which I have determined to lead to each of the taillight filaments
> in the respective bulbs. These bulbs, with their two filaments each are
> apparently supposed to provide for all three functions (running, turning,
> stopping).
>
> Of course, my vanagon has a separate bulb (and circuit) for each of these
> functions so I'm stuck with the problem of fitting three circuits into two
> circuits.