Friends, my electric skills are limited, so some help is needed. :-/
As an additional 6 volt 20A electric fan for cooling I bought this one:
http://www.limora.com/de/elektroluefter-1-153129.html
and it works great when I test it with a simple on/off switch directly connected with a 20A inline...
T-Bird55
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6volt fan
6voltrelay
connection
cooling fan
fan
relay