On Wed, 16 Dec 2009 04:39:49 -0800 (PST), Andy Dingley wrote:

On 16 Dec, 09:51, Adrian wrote:

Or do it the other way round, and plug the low-voltage into the car,
keeping the charger.

Voltage drop in the cables screws with measuring float voltage. Where
this is done commercially, it's a 4-lead setup back to the sense input.

How about a nice hefty battery cable to a proper Anderson connector? You
can keep only the low voltage on the car then and there'd be next to no
voltage drop on the extra length of cable with the low current of a charger
and the large CSA. You'd also have the added bonus that you could use the
connector for a plug in set of jump leads. I keep meaning to get around to
doing this on my kit-car.

SteveW