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AC adapter wiring?

post #1 of 4
Thread Starter 
Can anyone tell me how to tell which wire on an AC adapter is positive/negative?

Want to solder on clamps to use a 13.6VDC for a trickle charger for small batteries (motorcycle type).

Think the batteries are 4ah, way too small for the regular 10/50 amp car charger.

Thanks!
post #2 of 4
Best way to tell is with a Volt-Ohm-Milliammeter, Use the "Volts" scale, and if it reads backwards, you have the wires wrong.

If you don't have one, look at the wires coming out of the adaptor carefully, one usually has a "trace" ...either a thin white line, or a raised rubber one. That would be the "positive".

If there is no "trace", perhaps one wire is silver and the other copper. The copper is plus. If the plug is still on the wire, the end of the plug is plus (the TIP), while the"ring" is minus.

If you have none of the above, but there us is still some juice left in the battery, a quick swipe across the terminals will yield a bigger spark one way than the other, The "big spark" configuration is BACKWARDS!

AMMO
post #3 of 4
Quote:
Originally Posted by AMMO View Post
Best way to tell is with a Volt-Ohm-Milliammeter, Use the "Volts" scale, and if it reads backwards, you have the wires wrong.

If you don't have one, look at the wires coming out of the adaptor carefully, one usually has a "trace" ...either a thin white line, or a raised rubber one. That would be the "positive".

If there is no "trace", perhaps one wire is silver and the other copper. The copper is plus. If the plug is still on the wire, the end of the plug is plus (the TIP), while the"ring" is minus.

If you have none of the above, but there us is still some juice left in the battery, a quick swipe across the terminals will yield a bigger spark one way than the other, The "big spark" configuration is BACKWARDS!

AMMO

Be careful...normally the "identified" (trace wire) is designated to be the grounded or neutral wire on a 110 volt circuit cord, not the hot leg.
post #4 of 4
Thread Starter 
Quote:
Originally Posted by deadwoodken View Post
Be careful...normally the "identified" (trace wire) is designated to be the grounded or neutral wire on a 110 volt circuit cord, not the hot leg.


Thanks Ammo

DW, I'm guessing that "would'nt" be relevant in this case, as the wire coming from the adapter is DC, correct?

This would be pretty much the same as a store bought slow charger, is what I'm thinking? Just have a few extras (I don't throw anything away ), and trying to save a few bucks.
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