Hopefully someone else will chime in with more details about the W124 cars.

I thought the ELR's were all mounted on the firewall - somewhere. Perhaps over near the brake booster?

SteveM

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner