W108 wiring problem with lights: Please Help - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 01-03-2013, 08:49 PM Thread Starter
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Date registered: Sep 2012
Vehicle: 1968 250S
Location: Rogue River, Oregon
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(Thread Starter)
W108 wiring problem with lights: Please Help

Have spent months and way too much money restoring the 1968 250S for my son, but it's been fun. However, there is one major hurdle left and it's in the wiring for the lights. I'm losing what's left of my fading mind trying to find the problem. Maybe someone out there will have their own light switch go on when they read the rundown of how the lights currently work and steer me in the right direction.

Done so far: I have cleaned every connection in the fuse box, replaced all fuses with new copper ones, cleaned every electrical connection, all the contacts in the taillight assemblies and every grounding point I can find. Removed each fuse one at a time to see if anything changes: it doesn't. Unplugged the instrument panel, the emergency flasher unit, the flasher unit one at a time and no change (other than, of course, that particular thing not working). Took the emergency flasher switch apart; it looks like it just came from the factory.

Here's how everything works right now:

Key OFF:
Light switch 1 click Left:
Right front parking light on
no lights in rear

Light switch 2 clicks Left:
Left front parking light on
Right rear brake light on (the inside, pointed part of the fixture, right?)

Light switch 1 click Right:
Dash lights, heater lights on
Front parking lights on, dim
Left taillight & right tag light on

Light switch 2 clicks Right:
Dash lights, heater lights on
Headlights on, working correctly dim and bright
Front parking lights on
Left taillight & right tag light on

Emergency flasher:
Left front blinks, right front blinks dim
Left taillight, right tag light and right turn signal blink
Dash lights/heater lights blink
Left turn signal indicator blinks on dash


Key ON:
Light switch 1 click Left:
nothing

Light switch 2 clicks Left:
nothing

Light switch 1 click Right:
Dash lights/heater lights on
Front parking lights on
Left taillight and right tag light on

Light switch 2 clicks Right:
Head lights on, working correctly bright and dim
Front parking lights on
Left taillight and right tag light on

Emergency flasher:
same as with key off, above

Left turn signal on:
Left dash indicator blinks
Left front signal blinks
Right (!) rear signal blinks

Right turn signal on:
Right dash indicator does not blink
Dash lights and heater lights blink
Right front signal blinks
Left front signal blinks dim
Left taillight and right tag light blink

The brake lights do not work.
The back up lights do not work.

I welcome any ideas you may have. I may have to take it to a wiring guy, but fear it will cost a fortune with no guaranteed results. I want to keep trying myself, but desperately need some direction.

Thanks,
Jay
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post #2 of 3 (permalink) Old 01-04-2013, 09:10 AM
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Date registered: Nov 2012
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the problem could be caused by a wrong bulb , like a 1 pole bulb in a 2 pole socket , i dont remember if a 250 s has any 2 poles sockets .unplug front and rear lites , and try like turn signal on one side , and use a test lite to see which side does work .
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post #3 of 3 (permalink) Old 01-04-2013, 10:35 AM
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Date registered: Jun 2007
Vehicle: '70 280S-'73 450SLC-'81 380SL-'84 500SEC Euro-'92 300SL24-'95 E320
Location: Northcoast of Ca in Eureka
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I feel your pain. Had similar, but not as extensive, problems as you do. I have a '70 280S and did virtually everything you did. After the car came back from paint, I realized the only thing that I didn't do was stupidly simple and solved all my lighting issues. I removed the ground strap between the radiator and engine block. Not only did I clean up the cable itself, but I cleaned both attachment points until I could see fresh metal. I couldn't believe how something so seemingly unrelated could do so much. Good luck to you.
dws


1973 Mercedes 450SLC (PineGreen/MahoganyLeather)
1981 Mercedes 380SL FORSALE (LtIvory/PalominoMBTex)
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