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Old 06-04-2013, 07:14 AM
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Join Date: May 2003
Location: Hunterdon County, New Jersey
Posts: 146
1977 450SL no directionals/hazard

Good Morning,

I have a friend who has a 1977 450SL that the directional and hazard lights are not working. All fuses have power and all other lights are working properly. I remember in my 123 diesels that if the switch was not fully engaged on or off, niether the diirectional or hazards woutd work, Could this be the switch or is it the flasher relay or both? A little guidance would be greatly appreciated!




1991 300TE (280,000)
1985 300TD (432,000 miles - retired)
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1975 300D (165,000 - retired)
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Old 06-04-2013, 08:52 AM
JimFreeh's Avatar
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Join Date: Mar 2007
Location: Hampton Roads, Virginia
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Originally Posted by 300TD View Post
Could this be the switch or is it the flasher relay or both?

I recall that the 1977 model had the flasher and signal function integerated into the flasher switch. The units did not become separate until 1982 or so.

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Old 06-04-2013, 09:49 AM
is thinning the herd
Join Date: Mar 2010
Location: Columbus, Ohio
Posts: 3,330
Like Jim said the flasher, relay, and hazard switch are all one. Grab a spare switch and try it. However make sure your hazard switch is plugged in. I bought a 123 with no signals or hazards and upon pulling the center console it was simply unplugged. A previous, inept mechanic had not noticed it I guess.
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Old 06-05-2013, 11:03 AM
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my bet is the hazard switch. They can be taken apart and cleaned, ever so carefully
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Old 06-05-2013, 03:36 PM
Join Date: Sep 2005
Posts: 664
And if it is just shot then post a 'wanted' in the parts section. Most 123 owners have a few of these laying around.

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