Instrument cluster lights
#2
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Join Date: Aug 2005
Location: SW Florida
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'93 190E '87 560SL '80 240D '91 420 SEL '70 300 SEL 6.3 '02 CLK 430 Cab
#3
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Join Date: Jul 2023
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1984 230ce 5spd , w211 e500 4matic, r230 sl55 amg
If I were you with the new found knowledge I have I would do this in order.
Check fuses
Make sure 15pin mushroom is cleaned and seated properly.
Check all grounds. behind cluster, rear right taillights. front right taillights even one under the car near the oil pan. To remove the gauge cluster you need a special tool it looks like a thin long piece of metal with handles on one end and a notch on the other.
Check the bulbs/reflector these can go bad and not cause the lights to work.
Inspect board for burnt traces,
Make sure 15pin mushroom is cleaned and seated properly.
#4
Junior Member
Check the rheostat controlling the bulb intensity. They stop working after 40 odd years. You can take it out, or just solder a wire onto the two pins, effectively bypassing it and putting the dash lights in its brightest setting. I replaced the two illumination bulbs with LED's as well.