Now I've replaced both the relays without solving the problem.

I've jumped the FPR and the car runs without problems.
It's a little difficult to check the relay bases, but both the 30 on the FPR and the 15 on the OVPR are hot.

Sombody got any idea how to get it working?

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frogs
Mercedes 190E -86
Kawasaki Voyager 1300 -85

Fredrikstad, Norway
Heia FFK!