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Old 03-20-2021, 12:05 PM
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Join Date: Feb 2014
Posts: 68
W124 and W126 headlight wiper motor and washer mod?

Hi all, I was interested in adding headlight wipers and squirters to my W124. I have all the parts except the harness. Upon tracing the harness on a junkyard car and realizing the wiper motors are tied in with the headlights, etc, and tracing the harness along both fenders for about half an hour to where it goes under the battery tray, passes through to the other side of the motor to the fuse box, etc, and enters the firewall in many places, I figured no thanks I'm not that interested in all of that wiring.

Instead, I need your expertise. And no I don't need the naysayers saying "you don't need headlight wipers". My reasons are my own. Since I'm not an electronics guy, do any of you have an idea in DETAIL where I could directly wire a toggle switch directly to the wiper motor and that second squirter motor and have it's own inline fuse, etc? I have many zebrano console wood pieces with 'extra' cutouts for other options that I could put a switch into. That way I'd only have to wire from the engine bay and through the firewall in one location once. Anybody have any ideas? I guess the wipers would need maybe their own relay to make the wiper arms 'rest' so after you let go of the switch they don't just freeze where you turned them off.

Please advise, and thank you as always!

Last edited by nehuge; 03-20-2021 at 12:15 PM.
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Old 03-25-2021, 06:49 AM
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Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,077
Sorry, but I cannot help you with the wiring scheme you desire.

As you probably surmised the headlight wipers (on vehicles equipped with them from the factory) only function when the headlights are "on". In your case it would likely simplify things if the wipers and sprayers worked whenever you flipped the toggle switch, whether the headlights are "on" or not. Achieving a "rest position" is important because the headlight wipers look really odd when they are at some intermediate position.

Fred Hoelzle
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