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300d alternator wiring help 300d alternator wiring help
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Old 04-29-2015, 01:25 PM
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Join Date: Jun 2013
Location: PNW
Posts: 242
You MUST have a light bulb or similar wattage load connected to the alternator "BATT" wire! And the correct wattage bulb ONLY!

The alternator needs an "excitation voltage" to get going and that is provided via the BATT lamp - and the correct current [amperage] is provided when using the correct wattage bulb.

Here is technical information on this...

Pelican Technical Article: Alternator System Troubleshooting

For more, search google.com for the following words...
bosch alternator excitation
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