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Old 06-05-2014, 11:26 AM
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Turn Signal Question

I've got a '92 300SD w140, but that probably doesn't make much difference.

My right directional has gone fast blink. I know that is usually a bad lamp either front or rear, but I checked them both and they are both working. I had the front assembly out a couple of days ago and it may have started as a result of that, but can't be sure. I took it out again and looked it over. No wires seem out of place or insulation shot either.

Any ideas?
Thanks, ARW

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Old 06-05-2014, 11:59 AM
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Location: Matthews, NC
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First step (and usually the last on a problem like this) is to turn on the emergency flasher switch with the car off and other lights off. Look closly at both sides and look for a difference between left and right. You will be looking for a difference in the lights that are flashing and the brightness of the lights. If you don't see any difference, turn on the parking lights with emergency lights still on. Again look for any difference in the left and right. If you still don't see a difference, start the car and have some one hold the brake peddle down.

99% of the time you will see something that is different and then know where to start looking for the problem.

Let us know what you see.

Paul
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84 500 SEL (307,xxx miles)
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Old 06-05-2014, 01:59 PM
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Turn Signal Question

Thanks pmckechnie,

Worked like a charm. Turned out the right side was considerably dimmer. I assumed (always a danger) that, since the signal worked, the wiring was OK. It wasn't. The ground connection pin had separated from the wire. As the whole assembly is plastic, I have not a clue to how it was working at all, but fixed the connection and it works fine.
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Old 06-05-2014, 03:52 PM
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Great

Paul
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84 500 SEL (307,xxx miles)
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Old 06-05-2016, 03:47 PM
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Directional fast blink

Now it's two years later and the problem is a little different. Still the '92 300SD (with its exceptional wiring!). Had some problem with a short draining the battery. Haven't found it yet, but got it to go away. I think it may have been in F3f17 as I found removing that fuze got rid of the drain. Inspected the various things on that circuit, found nothing, put all back together again and it works. Turn signal/Hazard Warning are on that circuit. I know that's not a fix, but it has to fail again before I can find it.

Problem is, and has been since the beginning that the left signal blinks fast with the stalk in any position (left, right, center) and the key in accessory (1) position. With the key in run (2) position, the left signal blinks fast in either left turn or center (no turn) and fast on the right side in right turn. It seems to me that low voltage makes a fast blink, other than a bad lamp. Any ideas greatly appreciated. I have also just learned that the hazard signal blinks at the normal rate and supersedes the turn signal. Also, if I turn the key slowly from off to 1 and stop turning just as the accessory power kicks in, but before the click into position 1, the turn signal blinks at the normal rate in all three positions. Thanks


Last edited by pokeyarw; 06-07-2016 at 05:20 PM.
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