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How do i test to see what amperage my alternator is?

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68 Camaro RS, Built 355, 274 Comp Cam, Sportsman II Heads 200 c.c. 2.02. Ported to Performer RPM Manifold and 1.75" Headers, 1.5 Roller Rockers, 650 Holley, Steel Crank, 12 Bolt posi with 4.11 Gears, TH350 tranny w/ shift kit.
 

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Eric the best way is to look at the amp number stamped in the alt case. the other way is to have a shop test it.

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67 prostreet BB Camaro
80 z28 Camaro 355ci
71 BB SS Chevelle (clone)
2002 35th anniv SS Z28 conv.
 

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Erik, you can try an inductive amp meter placed around the larger wire on your alternator. Many battery testers have this feature for checking the charging system. Some places will do it for free like Auto Zone. This however will just tell you what that alternator is putting out, not what the rating is of the alternator. You could also check the part number and try to cross reference it. This isn't fool proof either, someone could have rebuilt it for higher output internally.
Not an exact science but this should get you in the ball park.

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Drew

69' X-11 350, Turbo 350, Factory Air, PS, PB, 12 Bolt (410 gear) & NOT AN SS
 
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