Thank you very much
I will do what you advised me to do thanks .
No problem I am a very young teacher in mechanics . I work with kids (17-20years old) in a workshop all day with many CNC and conventional lathes and milling machines . So I am no electrician , electricwise I usualy try and see lol . For the connector I took the biggest I could find they are 5mm diameter I've test the car for a good 10 minutes they didn't get warm or anything and they are very stiff to separate , but I will be carreful next monday where they'll be fully tested for 2hours .
thank you again .