Issues with no turn signals. Running light. Brake lights intermittent. All the bulbs are good, fuses are new... Cleaned the terminals in the fuse box as well. Still having probs

Maybe a bad ground somewhere??
Where are the grounds for the tail lights and side marker lamps.

Any suggestions on further troubleshooting? Thanks !!

On a car that old ground problems are pretty likely. I don't remember exactly where the ground points are, but on Mercedes brown is ground.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

Yes, sounds like ground problems...
try taking a good sized wire and installing it from the neg post on the battery to the engine and the car frame...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

What are these relays used for?

And this relay is for what also?

Attached Thumbnails

 

Not sure about the photos in post 4, but the picture in post 5 is the external voltage regulator for your alternator. More modern MBs have it integrated into the alternator itself, but on (some? all?) w115s, they have that external voltage regulator located on the left side of the engine compartment (as you are looking at the engine).

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).

Never had a problem with my W115, but on my w123 I had no turn signal when the hazard switch was loose. Maybe that could be the turn signal problem.

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1974 240d
1983 240d -sold
1989 420sel with om606
1994 s350 turbodiesel - sold

I don't think that issue affects the 114/115.

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.