View single post by Mark Rosenbaum
 Posted: 05-17-2006 12:09 am
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Mark Rosenbaum

Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
I'm not completely certain as I haven't worked with Lucas alternators, and a quick internet search wasn't much help.  However, it appears that if the bulb is out or is bad, the alternator field may not receive any power when the engine is started, and if so, the alternator will never start charging.  Certainly it can't hurt to have a good bulb there.