-=> CHARLES ANGELICH wrote to JASEN BETTS <=-

 CA>> The left side speaker only clicked for awhile then stopped
 CA>> and would do nothing. The right side works but the left
 CA>> seems to be fried?

 JB> ook! Well you're in luck! you see if one side works you can
 JB> compare similar points on both lleft and right circuits and
 JB> where they don't match your near the point of failure.

 CA>> I really don't understand why since the 12v was less than
 CA>> the 15v marked on the speaker containing the amplifier?

 JB> polarity?

 CA> Polarity is a _good_ possibility. It is marked 'VDC' but
 CA> nothing about polarity.

Oh my, that's not good as there is no standard :-(
I break out good lighting, some close work glasses and look
for a embossed or printed emblem on both PS and 
powered item. _Most_ stuff I've run into has an indicator that
looks like a three quarters circle broken at one point with 
a line leading out of a point in the center of the circle 
indicating the center connection which has a + or - sign.
These polarity indicators if present are *tiny*, often
just a raised plastic symbol the same color as the rest
of the housing.
Lacking any of that I've a continuity testor I built
many years ago to carry with me on the motorcycle
for troubleshooting. Nothing but a 12 volt light bulb
and in parallel with that crrent limited bi-color 
polarity sensitive LED with alligator clips on either end.
 
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