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That relay should be fine for your needs. 180Ω is the usual impedance of a PCB or "ice cube" style relay. It is worth using the correct relay to preserve function of the darlington pack in the ACC unit, they can break down easily if overloaded. My SDL had a bad darlington pack that had the module controlling the Klima relay fail in an open state. The darlington pack is no longer made and has to be sourced from existing stock, not easy. The cutout relay can be anything since it isn't transistor switched.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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