Your mechanic sounds like he should be in the fertilizer business. He could supply his own product by talking to the delivery trucks!

Only one of the two terminals on the outer perimeter of the alternator needs to be connected, unless you plan to run a "no charge" warning light. Connect the red wire on the connector to the big terminal at the back of the alternator and run a heavy (#10 or bigger) wire from there to the battery + terminal. The brown wire on the 2-pin connector can be used as a ground for an idiot light, with the power for the light connected to ignition or accessory voltage.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!