I think this is the best trouble free solucion:
https://www.whitworths.com.au/main_i...AbsolutePage=1
and one Relais.
Important : this Johnson swich has a timer for 4 second !
With this combinatioin i have never more probleme with this parts.
i see this swich are in whitworths are very expensive, i pay in Westmarine 42.- $
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Norbert