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I have a 1975 450Sl and the ICU is located on the driver's side, in the front wheel well on the fender just below the coil. It's a cast aluminum looking box. Otherwise, running from your distributor is a covered wire that holds two internal wires (I think two)... trace that back as it will lead you to your ICU. Tim

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Q: Where is the ignition control on a 1973 450sl?
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