Hello to all and especially Jerry,

Update:

I was able to solve the problem.
First, I had the Cole Hersee relays mounted with the "head/imprint" up. According to Cole Hersee the relays should be mounted like this. The inside contact pin is pushed down by the spring and gravity helps as soon as the tension is removed.

And, as Jerry advised me, I was able to get the motor set up well so that it starts fine.
Thank you all for the help. You guys are awesome.

Greetings Brian

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1970 Chevrolet C10 Stepside and 1966 Chevrolet C60 Firetruck (Germany)