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Old 08-07-2005, 11:35 PM
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Join Date: Mar 2001
Location: SF
Posts: 214
86 300E Charge Light

Hey folks, used the search and can't get what I want. I have NO charge light, at any time. Question: What can give you NO charge light (other than the bulb), key on, engine on/off? If the bulb is burnt out, will the field of the alternator NOT get any juice to start the charging process? Seems kinda dumb from a fail-safe stand point, if thats the case, but I would value any thoughts! Thanks much, Clip BTW I am upgrading to 80A as well..

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Old 08-08-2005, 12:24 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 37,996
if you get no light

at any time yes, it may be the bulb in the idiot light. that should not affect the charge function.

tom w
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

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Old 08-08-2005, 08:17 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153

The small BLUE wire that goes to the alternator MUST ground the bulb when the key is on the the engine isN'T running!

SO if you disconnect the wiring to the alternator & ground ONLY that small blue wire in that plug the battery light should come on when the key is ON!

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