So. My driver's side parklights have failed. All other lights work fine, turn signals brake lights, hazard, plate lights, passenger side park lights. JUST Drivers wont work. Its not the bulb or the fuse.... could it be the headlight switch? Its always been a bit wonky. If its not in just the right spot, dash lights wont work, so maybe its decided to fail a bit more?? Any insight would be appreciated!!!

try the switch position to the left of off that turns on only the driver side p lights. the switch could be bad but it shouldn't be bad in two different places the exact same way.

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James 4:8

"...let us put aside the blindness of mind of those who can conceive of nothing higher than what is known through the senses"
-Saint Gregory Palamas, ---Discourse on the Holy Transfiguration of Our Lord God and Savior Jesus Christ


Centrally located in North East Central Pa.

The individual sides aren't working either. Just the passenger side when the headlights are on.

The individual sides aren't working either. Just the passenger side when the headlights are on.

Bad light monitor relay in the relay box behind the fuses. BTDT. It’s the huge relay in the relay box. I was able to open mine up and find the bad joint and repair it.

Fortunately this relay was used across the W124 range and also the 86-91 W126 so they are easy to find in junk yards. Also the light switch is the same, it plugs in on the back side and has a bayonet mount to the dashboard so very easy to replace.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech