Many years ago when I drove my first 240D, a '77, the relay was quite expensive. I simply got a spring loaded rocker switch which was a window switch and put it in one of the empty switch holes in the dash. I then wired that to a Ford starter relay that I mounted near the battery. I ran heavy wire from the battery to one heavy post on the relay and heavy wire from the other side of the relay to the fuse box on the firewall behind the engine. I then just pressed the switch and let it glow. After a Fall or Winter morning or two, you will get the feel of just how long to hold down the switch before starting.

Worked great and at a fraction of the cost of the MB relay.

The spring loaded "rocker" is much tidier than my "push button above the left knee" but with mine I can use my right hand to turn the ignition key while I fire up the GPs.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"