Re: 1982 Honda CB 650 -- Electrical / Charging problems (as usual)
- From: "FB" <flying_booger@xxxxxxxxx>
- Date: 27 Apr 2006 13:23:05 -0700
Rob Kleinschmidt wrote:
You ought to start by making sure the battery is good.
Sounds like you already have a multimeter. Charge the
battery with a charger and test the voltage. A good shop
can also test the specific gravity and/or load drop and will
do this as a courtesy as part of selling new batteries.
A sulfated battery will charge up to the recommended voltage and the
specific gravity will show the battery is fully charged while it
actually only has a surface charge on the
plates. It will fail the capacity test.
All that's necessary to do the capacity test is to hook a motorcycle
headlamp across the battery terminals. A 55-watt headlamp will draw 4.6
amperes.
If the battery in question is a brand new fully charged 12 ampere hour
battery, it should light the headlamp for 12 / 4.6 = 2.6 hours without
the voltage dropping below 12 volts.
.
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