Good point, there are 2 feeds on different fuses to the relay.

One is switched for the turn signals, and the other unswitched for the 4-ways.

Be sure both (really you ought to check that all) fuses are good. Remove them and inspect them. I had one that had a micro crack right at the bend. Looked great but as soon as I pulled it the strip fell apart in my hand.

If you find any corrosion on the fuse tabs, do not abrade them with anything. This will destroy the plating and make the situation worse. Use some Tarn-X or silver polish on a q-tip.

__________________
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