Re: Help with battery charger

Posted by Bob M on February 04, 2004 at 17:52:44 from (66.67.6.39):

In Reply to: Help with battery charger posted by 26Red on February 04, 2004 at 13:10:07:

You can determine polarity without a meter. You'll need a small 12 volt light bulb (instrument or side marker light bulb, or similar), a short wire scrap and a good 12 volt battery.

First mark one of the charger wires to identify it. Now wire up the lamp between (in series with) the marked wire and the battery +. (i.e. connect the marked wire to one terminal of the lamp, then the wire scrap from the other lamp terminal to the battery + ).

Now with the charger TURNED OFF, take the unmarked charger wire and touch it to the battery negative post. If the bulb stays dark, the marked wire is the charger +. However if the bulb lights (it may be somewhat dim), the marked wire is the charger negative.

Once you've figured out the polarity take some red tape or red paint and permanently mark the charger + wire

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