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Old 07-21-2013, 06:08 PM
SD Blue SD Blue is offline
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
A failed bulb can give you a no-charge situation. The alternator field excitation comes from Battery-Ignition Switch-Charge Indicator Light-Alternator (blue wire). With the alternator disconnected, you should read +12Vdc on the blue wire, and ignition switched to RUN.

If you are not getting other warning lights as well, you may have an ignition switch issue.
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Sam

84 300SD 350K+ miles ( Blue Belle )
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