Not sure if I'd trust using a charger, many of them have safety circuits that limit voltage/current and want to see at least 1v before they'll put out any power. I tested mine with a set of jumper cables on a good battery (using channelocks to hold the plugs as they -will- get hot).

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale