fixed it
Thanks Skip,
I have been working on this over the weekend, checking it out with a multitester and getting nowhere. I put in a separate fuse for the lights, so at least the engine keeps running. After trials and tribulations I found some cocons of bugs or insects inside the lightswitch, in the bottom part. There it made, now and then, a short between the earthcontact of the horn and the other positive contacts.I cleaned it out with a lot of contact spray and the problem is gone.
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