300D 1977 charge indicator light not coming on... ?

Ah, I've had a little saga already on this message board. When the cold desists a bit and I can drive out again, I will most likely get the battery replaced.
But in the meantime, another curiosity... I managed to charge the battery of my 1977 300D -- I had to twiddle the cables around a little before it oddly started showing the charge needle on the display correctly at 0, I don't know why it was so picky about me clipping the black - cable to a place on the chassis... although the charge didn't go up 100% and stopped at 75% for some reason.
Anyway, I'll deal with that later. What I'm wondering now, if it's the roots of a bigger problem:
When I took the car out for a little spin, I noticed the battery charge indicator light, the little battery + - picture that's supposed to be illuminated in red... it didn't come on at all when the key was in Position 2 as it states in the manual. I never saw it come on... then again, I can't recall if it came on before , my memory's sort of hazy and this car is aging!
Is this a sign of trouble? For example, if I drive the car around without that light ever coming on in the first place, does that mean it will likely go dead all of a sudden in the middle of the road?
Thank you so much. I tried to Google about this but there was no pertinent information.
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well..in 27 years... it appears that the charging indicator blub has gone out youll have to pull the cluster in order to replace...or live with it...since you have a diesel...a running engine will not discharge the battery, but then again...i personally dont like things that are there, but dont work (heard that somewhere here and felt it expressed exactly what i would think :O))
when u charge the battery externaly...use the posts ON the battery...not some part of the chassis
alex

desists a bit and I can drive out again, I will most likely get the battery replaced. But in the meantime, another curiosity... I managed to charge the battery of my 1977 300D -- I had to twiddle the cables around a little before it oddly started showing the charge needle on the display correctly at 0, I don't know why it was so picky about me clipping the black - cable to a place on the chassis... although the charge didn't go up 100% and stopped at 75% for some reason.

roots of a bigger problem:

indicator light, the little battery + - picture that's supposed to be illuminated in red... it didn't come on at all when the key was in Position 2 as it states in the manual. I never saw it come on... then again, I can't recall if it came on before , my memory's sort of hazy and this car is aging!

that light ever coming on in the first place, does that mean it will likely go dead all of a sudden in the middle of the road?

information.
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Writes:

It sounds like you need a new alternator. My 1980 300CD did the same thing when the alternator was worn out. I'm told that when Bosch alternator brushes are completely worn down, you will not have a working charge indicator light.
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