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Did some more searching and learned how the charge light works
Quote:
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Originally Posted by trontek
a schematic drawing of the Bosch regulator on my '77 alternator? I'm still having trouble making sense of how the charge light iluminates when the alternator is not charging but does not lite when it is charging.... One side of the bulb is grounded and the other goes to the D- connector on the alternator, which is also one input/output of the regulator.
I know - if it works, don't worry about it - I just wanna know HOW it works.  |
I crossed a line while tracing the wiring diagram in the above quote. As I mentioned in an earlier post(this thread), one side of the light is tied to battery + 12v thru the key switch via the fuse block(on my '77). the other side goes to the D- at the alternator/regulator and supplies external exciitation current while the llight is iluminated. When the alternator starts charging, 12v+ is applied to this same, point causing the same potential on both sides of the bulb so that no more current flows thru the filament and the light goes out.
Someone let me know if I finally got it. 
__________________
Jim
'49 170?(donated to church in Darmstadt '58)
'58 220S(crusher, after '73 fire[San Antonio])
'72 280SE 4.5
'77 240D
'81 300SD
'83 240D parts car
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