You don't really need an ampmeter. A volt meter & test light will diagnosit for you. Take the test light & make sure there is current at the large post on back of the alt. & at #2 connection at the plug in connecter. #1 term should light up the test light when you turn on the ign although it might not be very bright. The large post should be connected directly to the battery through the harness or junction block. The #2 term may loop right off the large post or tied in back in the harness. The #1 comes off the gen. light on the dash or through a resister or diode when the ign is on. If all these tests are good it should work. Test it with the voltmeter like Motif said.
