At some point, the 260E in the USA had a 300E 2.6 badge (300E on the left of the trunk, the 2.6 on the right side).

Or, as it happens now and then, if it should have a 260E plate, it was replaced by a 300E by a previous owner.

The warning light you mention is the "bulb out" warning. Either a headlight, fog light, stop light, turning light or corner light is out (front or rear).

The check the system, turn on your car and don't touch the lights or the brakes. The warning should remain off. If it comes on at start without touching the brake pedal or turning on any lights, then there is a short circuit.

After turning on the ignition place your foot on the brake pedal, if the warning light comes on is a rear brake light. If nothing happens, then turn one notch to the right the light switch. If the warning comes on is one of the corner lights. If nothing happens, pull the switch out one notch. If the warning comes on, if one of the fog lamps. No warning? Turn one more notch to the right the light switch. If the warning comes on, if one of the headlights (low beam). Nothing again? Turn on your high beams. Nothing again? Turn on your directionals.

When you figure out which light system is at fault, a visual check is necessary to asses which side is out.

Now, if all light are working properly and the warning light do comes on when doing the check, then a bulb with an improper impedance is being used.

Hope this helps.

__________________
A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]