Smaller pulley for an alternator - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-02-2003, 07:45 PM   #11
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As a general rule of thumb, don't use a deep-cycle battery (like the optima yellow top) for the car'* main battery. Use an isolater and run it only for the stereo, with an optima red top or other standard automotive battery for the main vehicle battery.

A deep-cycle battery can put an incredible strain on your charging system.
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Old 09-02-2003, 08:45 PM   #12
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Will it kill my alternator? It'* got a lifetime warrenty on it, so I'm not too worried.
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Old 09-02-2003, 10:26 PM   #13
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Actually the acquisition of the yellow top helped alleviate some of my initial woes.
The resistance of the batt seems to love taking a quickER charge, but then again, I can see your point on the deep cycle side. More power density requires more replenishment (so the math goes). Any recommendarions on a good isolator?

BTW, all I wanted was a smaller pulley. LOL. Thanks for the help here.
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Old 09-02-2003, 11:11 PM   #14
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My suggestion is to get ahold of speedguy........and get one of his better alts. The smaller pulley will only kill your rear bearing faster. Ty'* alt'* are beefed up internals, beefed up rear bearing, and smaller pulley.

Then get a red top for the car, and isolate it out to your deep cycle. You're probably talking a 200 amp alt, not the 160 I'm running.
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Old 09-02-2003, 11:22 PM   #15
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I've already got the aforementioned beef, yet only about 180A. Not to mention a 2.250" pulley. But it sounds like Speedguy would be someone to talk to.
Thanks for the info.
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