First photos shows wires they run next to the positive battery under the wiper assyembly. Second photo is where it goes to the plug.dontnknow what it does.

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1994 e320 (Charcoal and grey) 140, 000 miles

Bru, that wire is for your brake fluid level sensor. I can tell you that your 124 is the victim of the very well known biodegradable wiring harness issue. If you are seeing those wires like that, just know that there are many, many more like it hidden by wraps, etc. If you plan on keeping the car, you will probably want to replace the wiring harness. It is DIY'able if you are handy. The harness is not cheap, but shop around for the best price.

Rgds,
Chris W.
'95 E300D, 437K

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Objects in closer are mirror than they appear.

The connector you see on the metal apron near the weatherstripping bump seal is the starter hot wire point - it is used to test the starter or hot starting the car when in the workshop bay.

as chris said - the wiring being crumbled like that is a sure sign of other wires totally crumbling away inside the looming. if you are adventurous diy type and have no issues working with wires on engines then go for repairing it DIY, its a simple task of replacing the crumbly wires with new wires.

The bigger expense due to the crumbly wires is the failure of the electric throttle motor (same cracked and broken wires inside the motor too)

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Thank you I opened some looms up and found the wires like new and the plugs themselves look clean . Is it possible the prior owner changed the harness and left that behind because it wasnt big deal ..I checked looms at coil packs, thermostat housing, and throttle actuator all new loooking

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1994 e320 (Charcoal and grey) 140, 000 miles

Do some searches for the bio wire on this site. The wire is used vehicle wide, some cars have burned from under dash fires. The under hood wire comes apart first due to high heat. Interior is next due to sitting closed up in the sun.

I keep opening looms near high heat areas and finding no problems , sticker said 93 on the main plug.

I unplugged the switch with the deteriorating wires and car would not start. Maybee ill just fix that portion...thanks 4 the help.

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1994 e320 (Charcoal and grey) 140, 000 miles

the good wire was made after 1996

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt