the alternator works by being excited from the small terminal (warning light) this should be connected from a switched supply (usually ignition) so one end is live from the switch into the warning light and then to the alternator.The other large teminals on the alternator go directly to the battery, the alternator is earthed through the engine itself to the earth strap to the battery. Check your earth conection and correct the wiring it will work, if all is ok with the altenator.Hope this helps!
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