On Tue, 18 Mar 2008 10:07:45 +0700, Bruce in Bangkok
wrote:

[snip]
Try connecting a volt meter and an amp meter in parallel with the
battery charger. Turn the charger up to about a 10 amps charging
current and watch the volt meter. As voltage climbs the amperage
decreases. With about a 10 amp initial charging current by the time
the battery voltage reaches about 13.5 volts the current will have
decreased to about 1 or 2 amps. Hardly a battery killing combination.
[snip]

I would be very careful about connecting an amp meter in parallel with
any battery charger. At the least, you will have to replace a fuse
right away. At worst, all of the magic smoke will escape from either
the meter or the charger (or both), or you may find yourself rushing
towards the nearest fire extinguisher.

Joe