>Thanks, everybody. Sounds like the PD charger is the way to go.

I must say I was impressed with PD as a company, I was installing an
ASI camper interior from 1982 Vanagon into a newer 84 Vanagon a while
back.

http://www.californiavan.com/84ASI_interior/84ASI_interior-Pages/Image14.html

The original PD charger from the ASI had failed.  Not sure why,
perhaps I hooked something wrong and toasted it???  Anyway, first I
was surprised that they were a US company and still in business.
Then I called customer support and a human answered and said "sent it
to us, we'll fix it, should be about $17".

They repaired a 20+ year old piece of equipment for $17 + shipping.

Gotta love companies like this...no wonder they are still in business!

http://www.progressivedyn.com/history.html