electrical gremlins

[rumb]

Trying today to get my turn signals working.I tried swapping hazard switch, I do have 12v to the red wire for it though.

seems fuses 5, 7, 9 don't have any power.

9 - AC compressor, switch over valve idle stabilization(this might explain why my timing is off by a bit..)
7 -parking/tail/standing light left
5- parking/tail/standing light right
license plate
instruments
hazard warning flasher
shift indicator bulb
side marker lamps


I checked under dash and all large connectors seem to be well seated.

Any ideas how to proceed?

Also found two strange items under the shift panel, 1st a light bulb and 2nd a weird push pull switch both  with MB quality wiring.  Any ideas?The light bulb wiring come across from a connector under the dash-just 2 wires in a sleeve, though the brown ground wire with a connector on the end is not hooked up to anything.

I have the wiring diagram, tomarrow I am going to go get several copies made to trace some of these circuits.

[ptashek]

Also found two strange items under the shift panel, 1st a light bulb and 2nd a weird push pull switch both  with MB quality wiring.  Any ideas?The light bulb wiring come across from a connector under the dash-just 2 wires in a sleeve, though the brown ground wire with a connector on the end is not hooked up to anything.

I have the wiring diagram, tomarrow I am going to go get several copies made to trace some of these circuits.

Don't know what the push/pull is for, it's not something I've seen on either of my cars.
But the bulb is used lighting of the shift panel.

[rumb]

It's not the shift panel bulb, that one is there and has a square black plug it goes into the side of the shifter. you can just see it under the bend in he wire of the other one. 
Is there another one?  where does it plug in?

[rumb]

the switch has 3 poles, so you can switch it 2 ways, that is you could turn 2 different things on seperately, there are only 2 wired connected, so it would only turn one thing on or off.

[UTn_boy]

Given that your car is Euro, maybe it had a Trafficator, and the bulb was used to light the bezel up on it?  And could the push/pull switch be some sort of subsequent installation for two tone horns? 

[rumb]

I do have fanfare horns that were added later, currently there is the correct switch on console.  could have been earlier attempt.  I will over time find where they lead to.

Since I have the entire wire harness pulled from the parts car, I plan on laying it out to help trace where the wires go for the circuits that dont work.  Also just got copies of wiring diagram to mark up. 

The 3 circuits are switched power, so will use that as a clue to backtrack the circuit.

[rumb]

Does anyone have the euro 450sel 6.9 wiring diagram?  Mine is the US version.   much should be similar, but fuse #5 is very different and looks like a lot of it was moved to fuse 4 on the US version.

After color coding for a couple of hours, it looks like a lot of the problems all go thru the head light switch, and possibly the rheostat. 

the turn signals, still confused. The parts flasher relay was melted so no good, need to open the other one to inspect as well as open the emergency flasher switch if possible.It's possible that the relay is not good.

will try creatively using jumper wires to see if I can get anything to happen.

[djenka018]

"Trying today to get my turn signals working"

I would be inclined to believe that *all* the bllinkers of the era were wired the same.
Look at the circuit independent of the fuses

http://handbook.w116.org/ETM/77SEetm.pdf (page 3)
OR
http://handbook.w116.org/ETM/80s.pdf (page 13)

You need to look-up a pin that gets the 12V when ignition is on and confirm that there is low resistance to negative on one of the pins when indicator stalk is pushed to both L and R HS (disconnect the battery first).
Also, there should be 12V permanent pin (to allow hazard lights) but this is not critical for blinkers

What result does yield pressing the hazard switch?

The rheostat wiring is for the backlight of the hazard switch to be dimmed and no other function.

[rumb]

Thanks! 

I've looked thru that section of the site and never realized those are there.

R

[rumb]

Some good progress today.

These are all fixed by replacing burnt or missing light bulbs:
7 -parking/tail/standing light left -
5- parking/tail/standing light right
license plate
side marker lamps


\These I am thinking the dimmer switch, have not gotten to yet, other than to test my spare which works correctly
instruments
shift indicator bulb
switch bulbs


Tested flasher relay, with 12v and ground connected the output is always 12v, it does not switch between 0 and 12, no clicking sounds.

hazard warning flasher, both I have seem to have correct continuity to pins both button pushed and not pushed,

I'm going to order a flasher relay and hope for the best.


Anyway, some progress.

[UTn_boy]

Have you considered that maybe the turn signal stalk/switch assembly is bad?  They do go bad often.  Also, if your actual hazard switch is problematic/bad/disconnected, nothing will work.  The problem with these is that when they go bad, they don't show it.  Sometimes they even still work when depressed. 

[rumb]

I know the turn signal  switch works as I jumper socket pin 30 - 12V bus to pin 49a - which leads directly to the input wire of the turn signal stalk , and then I can try up and down and the right and left turn lamps (outside and in the instrument cluster) will illuminate.  they dont flash, just turn on, as by jumping the socket as I did it bypasses the turn relay. 

The Hazard switch as I tested and all pins have continuity correctly for both positions of the button.

that pretty much leaves the flasher relay.

[rumb]

wiring diagram

[rumb]

Got this from a fellow over on M-100.  Bill Babe  "WGB"

W116 Euro 6.9 Wiring Diagram Chassis No  1 to 003622 (Early)

PM or email if you want a copy.  File too large to post here.

[rumb]

Replaced the the dimmer rheostat and now have dash lights, heater/AC panel lights.  The light for the shifter still not working, that one gets volts directly from the fuse so I dont know what's up with that.

The front dome light not working still,  I found out there is a time lag relay for it, 000-821-30-47 but dont know where it is located at all. Anyone know where it is?

Turn signal relay due to arrive Friday and that should just about wrap up all the lighting gremlins.