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  #1  
Old 09-08-2010, 01:22 PM
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W123 Turn Signals Quit

The other day I drove the 300 after not driving it for about a week and the turn signals weren't working. They aren't coming on at all. The flasher/hazard switch works and that flashes the signals. After a few trips and turning the car off and on again the signals came back on for about two minutes then they quit again. I did a search and read that the wrong kind of bulb, a double filament bulb, can screw up the circuit but the hazards are still working. Any thoughs? Not sure if it's related but my horn/backup/#14 fuse i believe, keeps blowing.

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  #2  
Old 09-08-2010, 01:35 PM
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Sounds like you might have a short in the turn signal switch. Pull the rubber cover off and doa visual. Maybe pull it off and give it a look.
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  #3  
Old 09-08-2010, 02:08 PM
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Nah he needs replace his turn signal fluid.
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  #4  
Old 09-08-2010, 02:39 PM
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I have the same issue, and it turns out to be the hazard switch. When the turn signals quit on my car, I slowly move the hazard switch until the turn signals work again. I still need to order a new switch.
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  #5  
Old 09-08-2010, 02:43 PM
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Quote:
Originally Posted by rrgrassi View Post
I have the same issue, and it turns out to be the hazard switch. When the turn signals quit on my car, I slowly move the hazard switch until the turn signals work again. I still need to order a new switch.
Have you tried taking the switch apart and cleaning it.
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  #6  
Old 09-08-2010, 02:49 PM
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Quote:
Originally Posted by Biodiesel300TD View Post
Have you tried taking the switch apart and cleaning it.
No, I have not. I want a new one anyway to get the white triangle icon again.
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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 280K miles

03 VW Golf TDI 5 speed 400K Miles Engine died

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #7  
Old 09-09-2010, 11:19 AM
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The hazard switch is new, as is the flasher relay that's under the shifter area. I replaced those several months ago.
UPDATE: I drove the car for about 30 minutes yesterday and the signals were fine. THey started out not working then after about 5 minutes they started working and continued to work for the rest of the trip...what's going on?
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  #8  
Old 09-09-2010, 11:27 AM
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Time to check the combo switch...
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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 280K miles

03 VW Golf TDI 5 speed 400K Miles Engine died

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #9  
Old 09-09-2010, 12:07 PM
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How can I check it? The high beams work even when the signals don't. Luckily I pulled a combo switch off an old beater but I don't want to waste the effort unless I know it will help.
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  #10  
Old 09-09-2010, 12:14 PM
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I had similar prob this AM, but my Temp, fuel gages don't read. Brake wear sensor lite has been blinking at me, thinking it popped a fuse (new brakes, broke all the wear sensor leads).
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  #11  
Old 09-09-2010, 01:38 PM
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There is a relay on the later 123s (with the small hazard switch) which is located under the console, fwd and too the left of the shifter. Had to replace that on my 85 240D to make my turn singles work.
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  #12  
Old 09-09-2010, 02:30 PM
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Quote:
Originally Posted by saludayaker View Post
How can I check it? The high beams work even when the signals don't. Luckily I pulled a combo switch off an old beater but I don't want to waste the effort unless I know it will help.
Like I stated in my first post. Pull the rubber cover off, and give it a visual look to see if anything is obvious. You might have to pull it off and really look at it on the bench. It sounds like a ground problem. The ground wire in the combo switch could be loose or the wire partially broken. The problem is somewhere in the swtich. Since you've replace the hazard switch and relay, and the bulbs work with the hazards. Intermittent electrical problems are usually bad grounds or connections.
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  #13  
Old 09-09-2010, 02:31 PM
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Quote:
Originally Posted by moon161 View Post
I had similar prob this AM, but my Temp, fuel gages don't read. Brake wear sensor lite has been blinking at me, thinking it popped a fuse (new brakes, broke all the wear sensor leads).
Sounds like you need to check the grounds behind the cluster.
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'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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  #14  
Old 09-09-2010, 10:39 PM
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Quote:
Originally Posted by Biodiesel300TD View Post
Like I stated in my first post. Pull the rubber cover off, and give it a visual look to see if anything is obvious. You might have to pull it off and really look at it on the bench. It sounds like a ground problem. The ground wire in the combo switch could be loose or the wire partially broken. The problem is somewhere in the swtich. Since you've replace the hazard switch and relay, and the bulbs work with the hazards. Intermittent electrical problems are usually bad grounds or connections.
That sounds like some solid advice. Many thanks my friend.
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  #15  
Old 09-09-2010, 10:42 PM
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Let us know what you find.

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