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#1
08-28-2017, 12:21 PM
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tiny electrical gremlins?
1. I've had my 82 300d for about a year and a half. The other night I was driving and couldn't remember if I'd ever tried the cigarette lighter (I had cleaned the whole thing thoroughly and replaced the burnt out lightbulb, and that is functional).
After popping it in and waiting to no avail, I pulled it out and concluded the lighter did not work. Immediately following this I put my right turn signal on and noticed the arrow indicator was blinking double speed. I pulled over and determined my right rear turn signal bulb was out. Perhaps a coincidence, I replaced with spare in trunk and drove on. The following morning, however, I noticed my left rear brake bulb was also out - I know this bulb was fine a few days before. Could these two bulbs going out be related to my cig lighter? I'm afraid to try. 2. Another weird one, unrelated, is that 9/10 times when I turn on car at night, one of the dash cluster illumination lights is out. If I give the top of my dash (above the cluster) a very light pat, it always goes back on. What gives? I've had my cluster out, and can't seem to find anything wrong. It's so predictable - and the tap works every time - and the bulb stays lit for the rest of the drive.
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Andrew Montclair, NJ -------------- 1982 300D Turbo 120k Petrol Blue Green 
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#2
08-28-2017, 01:50 PM
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I'd suspect the lights burning out were coincidental. Remember that when you replaced the failed bulb, you can always disturb something else. Typically the contacts wear "flat" on the bulbs and fail to make contact.
Dash lights being flaky are a very common problem. Either you have a poor ground on the back of the panel (common) or the brightness dimmer is failing on you (even more common). The slap on the dash gives it enough of a jolt to work again for a period of time.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!)
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#3
08-29-2017, 03:03 PM
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Regarding intermittent dash issues, you may want to try running a new ground, as described in the webpage below. Since I've done this, my gauges have worked fine, with no flickering. Before I did this, one day while driving, the whole darned cluster went dead for a few moments before coming back.
Mercedes 300D 240D w123 Gauge Cluster Short DIY Fix | Up-Fixin | The Motoring Journal
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