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Old 06-22-2020, 08:36 AM   #3
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,663
Re: Heater core change. Now no charge

Type of Alt? If one of the 10/12SI internal regulated models, unplug and replug the two wire plug at the Alt. The brown wire is the excite wire and needs to have voltage from somewhere to start the Alt once things start spinning. On an idiot light setup, it gets the kick start voltage via the Gen/Alt bulb. On a gauge cluster, IIRC, there is a resistance wire that serves the same purpose.
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