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I have never had the need to do this but it seems a reasonable test would be: after you have the alternator flopped out reconnect the battery and measure the voltage on the disconnected blue wire to chassis (brown wire). It should be about 12 volts and the light should be out. Switch you meter leads over to current and use it to bridge the blue wire to the respective terminal on the alternator. Should read more than zero but less than an amp and the light should go on.
I am not sure why the blue wire goes to the anti theft unit but I would guess it is just a pass through to see if the engine is running.
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Rick
88 Cab
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