Some issues with 1976 W115

[kipperhughes]

Hi all

I have a 1976 W115 and recently started having some issues and looking for some help on whats the cause.

First issue is that the indicators have stopped flashing they stay on constant. It first started couple days back on cold start up they would start flashing then suddenly stay constant but would go to normal after the car had warmed up. But now its happening more frequently even after its warmed up. When the indicator stork is held down and not put in lock they start to flash but only when its on lock that they start flashing for while then go on constant. Also when the hazard switch is pulled it does same thing, starts flashing then goes on constant so makes me think its not just the indicator stork.

Second issue is that when the car is switched off sounds and feels like the engine is stalling like its spluttering and the car shakes. Its not a smooth turn off if that makes any sense.


Any help be amazing

Danny

[Lucas]

Which engine? There's a thread about the flashers and how to rebuild it. Cheap and easy.

Can't really say the shutdown because I don't know what it is. If diesel it could be not cutting the fuel correctly.

But usually that's your timing being off.

[kipperhughes]

sorry didn't put that in my post, its a 200 petrol. Thanks for the info I shall have a search for the thread on the flasher rebuild see if that solves the problem

[Lucas]

I have it tagged somewhere if u don't.

It's just your timing man. Get the fsm and follow the procedure. Timing light is cheap. Good easy thing to learn.

There's tons of tutorials on YouTube that's a basis. Then use the fsm.

You can spend a lot of money buying a new flasher piece. But the weird thing about the 114/115 is the flasher component is behind the emergency flasher switch. Attached to it.

[Lucas]

Check out post 5. You pull the emergency part in the dash. Capacitors in there.

I haven't done it. Mine seem to work again. But I assume you have to desolder or something. If you post some pics of it once it's out I'll have some perspective.

You can do what the original poster did. Kinda hack job and replacing capacitors are easy and cheap. Radio shack could carry the ones you need. They have some sort of number on them. Resistance I believe. Let us know what happens.

Flasher Relay W115 W114

[Lucas]

And put your location in your bio. Someone may offer for you to stop by. Welcome to the forum.

[Idle]

I have had this bulb problem on other cars and it was always the bulb socket. They build up resistance over the years and ground out when the bulb is used. One car I had with this very thing was a 1975 Opel which has a lighting system very much like the one you are dealing with.

Start with replacing the bulbs since they are cheap and don't just bop down to the AutoZone for some replacements. The amps in these systems are picky and you need to use real German bulbs that are made for these car. Pelican has them, or at least they usually do, and you don't need that many of them.

As you replace the bulbs use a small file to clean up the insides of the sockets. It does not take much of a build up in there to give you a grounded out condition.

And if this does not fix it then you are not out much and you know this part of your system is as good as it can get.

Also check your ground. I think the ground connection for almost everything electrical on these cars is in the trunk. Just look for a brown wire that is bolted to the floor of the trunk. Remove the bolt, clean the connections and the part of the body where it connects and bolt it back in. Again, this may not fix it but it is a good thing to do now and then.

[Lucas]

Didn't think the mention that. Definitely start there.

But with going on constant instead of flashing? A short?

My names Lucas I don't know if I should give electrical advice.

[Idle]

Originally Posted by Lucas

Didn't think the mention that. Definitely start there.

But with going on constant instead of flashing? A short?

My names Lucas I don't know if I should give electrical advice.

On many electrical systems from that era a constant tells you a bulb is burned out. But Mercedes electrical is not like US cars of that era.

So check to see if a bulb is burned out. It only takes one. But since sometimes it will flash that led me to think of a grounding issue that only appears when the conditions are right.

[Lucas]

I can say my flashes fast with a bulb out... Not to say his will.

[TnBob]

Id strongly suggest an LED bulb replacement.
LED's and capacitors are both cheeep on ebay.

[Foxglove]

I have had this flasher issue recently , that is , turn indicator on and it gives a couple of winks then stays lit.
I activated the hazard switch , multiple times , eventually it all started working properly again.