Join Date: Jul 2007
Location: Mexico DF
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the black is ground or negative. in a typical 12v dc circuit ground and negative is the same. For a boat there is a slight difference and it depends on your electrical circuit. Most boats with an inboard motor are "grounded" to the engine block and other fixtures, like through hulls, are connected to a "ground" (keel, or zincs) to prevent galvanic corrsion, this commond gorund is also wired to the negative pole on the battery.
For your simple installation, you can either use the ground, as described above, or simply wire your stereo to the negavite (-) wire/pole of your battery.
Valle de Bravo, Mexico
Merit 25, #302. 1982
Flying Tern 14', 1968
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Last edited by alecs123; 02-18-2009 at 12:58 PM.