See the fourth photo is my post #110 above (#5 in this thread). The connector in the wiring harness is where I tapped the third brake light into the Mercedes brake circuit. According to the eBay seller's description, you break the connection to the third brake light and wire the flasher into that wire, plus one wire to ground. There's a ground terminal just below the connector that I installed so it should be an easy install. I should be able to attach the flasher device to the wheel well with some double-sticky tape. I'll post another photo to this thread when the job is done, plus a movie, if the forum will allow it.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970