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W124s have a combination relay that handles the turn signals and 4-way flashers. It is designated "N10" and is the forward-most relay in the center column of relays in the relay section of the fuse box. Under the hood, driver's side, just ahead of the main firewall. Remove the fuse cover, then loosen (but don't remove, they are captive screws) six screws and remove the under-cover. The combination relay is part number 201 821 00 47. It was first used in the W201 class (190D/E, etc.) hence the 201-part number. It operates the rear window defogger (heat strip) also and something else--I forget.
There's a separate relay "h2" in the instrument cluster that makes a turn-signal clicking noise (that's all it does!). It should be OK.
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
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