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#1
12-15-2008, 09:19 PM
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1988 300e battery light on and off
My battery light has come on and goes off occaisionally but when I measure what's happening at the battery I get a 13.7 volt rating when the engine is running and a 12.8 when the engine is off... there is no variation...
what else could be an indicator when the battery light goes on... aren't these numbers pretty much where they ought to be? Thanks 
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#2
12-15-2008, 11:01 PM
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You need to visually inspect the voltage regulator brushes. If they are worn out they can go intermittent before they buy the farm. The other possibility is that a diode is failing, but before you worry about replacing the alternator check the regulator.
__________________
 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#3
12-16-2008, 10:49 AM
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Yeah, the regulator is a 5-minute job, and a cheap repair.
I had the opposite problem; regulator/alternator failed, and the light never came on. I only discovered the problem when the lights dimmed to almost nothing. DG
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#4
12-16-2008, 11:03 AM
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Brushes are easy to check. Safely elevate front of car enough so you can slide underneath. Alternator will be more to passenger side. Back side of alt. has 2 phillips screws. Remove both and out comes the volt. reg.
When new, the brushes on the volt. reg. are 1/2" long.
__________________
Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein"
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#5
12-19-2008, 07:12 PM
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Checked brushes
They were good.... still getting consistent 13.7 reading with engine running but the light on the dash mostly stays on and only on occasion will it go off for a few seconds....
Anybody have any other thoughts? Thanks
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#6
12-21-2008, 09:34 AM
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check all the ground straps
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