Definately weak alternator, car is probably running off just the battery. Replace brush assy. ASAP.
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744 & 745 GLE's (IPD a-sbars)16v M46, 245 SE(IPD a-sbars) auto, 242Ti M46(IPD springs and bars), 745GL 8v auto

When was the Aternator brush/regulator unit replaced? They usually last 100K miles.

Easy job, can be done with the alternator in the car. Easier if the oil filter is out, like during an oil change. I usually remove the heat shield from the exhaust manifold, too.

Disconnect the battery negative cable first.

The brush/reg unit is the black thing on the rear of the alternator. The two machine screws that hold it in place face the rear, and are either Philips head or Torx. Power screwdriver helps, it is an odd angle to get at.

If you decide to pull the alternator, have three new accessory mount bushings on hand. It's a good time to do them, too. Two in the alternator mount ears, one inside the adjusting link where it bolts to the block.

Everything goes back togdther without forcing. If the brushes balk, try another angle. They must ride on the slip rings. Which reminds me, while the brushed are out, use a mirror and flashlight to see inside the alternotor to check the condition of the slip rings. Small pits can be dressed out.

Good Luck,

Bob

:>)

Dont't know about 93s with airbags and ABS, but the charging loop runs thru the AMP Bulb in the instrument panel.
Check: there is a ground wire off the back of the Alternator to the block attaches at the motor mount.
Check: are your brushes are shot, pull the regulator/brush holder on the alt.

Why oh why don't they make 240s anymore :(
75 245(RIP) 80 244 226K, 87 245 172K

IIRC - (and I may be wrong here) but I think it will do that if the wiring is disconnected somewhere between the alternator and you ignition (red - charging) light. It may even do it if the bulb blows.

Do the lights go out if you run the engine up to 1500 rpm ?