The installation and repair of 120 AC volt electrical systems at the marine level is not all that baffling. It does take a little bit of care to get it right the first time. There may not be a second chance. The enclosed manual is a brief rundown of this type of system.
Ok, already read the manual? Here's the 120 volt wiring diagram?

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WikiPedia info about 120 AC wiring 
(North America) 
Also, what is AC power?
And, what is DC power?

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Link Me outta' here Scotty.

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  There are times when the choices we make, concerning cost vs. function, are not always on the right track...... The picture on the right shows two terminal strips. The upper one is an approved marine grade grounding terminal strip, designed to be used with eyelet end wire and costs about $30. The one below it was from a household fuse box , that was removed and used in a boat as a grounding strip. It was designed to be used with solid conductor wire, has no hold down insulating bracket and costs about $3. Guess which one failed and caused about $1,000 worth of damage to the electrical system?  Guess which one cost more?

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bat-term.jpg (15192 bytes)

I posted this photo of a "+" main battery cable for several reasons. First note the type of cable. This is house wire. Also, note that the eylet is not a marine type. And last but not least.. remember I said this was the "+" battery cable and it is black in color instead of red. Three strikes... and it took out the alternator.

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Instead of us re-writing something that someone spent time doing well...

Here is a link to: 

 

and

Basic Electricity - DC Circuits

and

Wiring Your Boat

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