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No. You need some decoupling, regardless of the battery voltage. I would still recommend:-if i use a 12v battery i only need it across the battery?
I thought you were going to use a much less powerful motor; but that's an option. If you do use a wiper motor you would need to reconsider the choice of fets to switch it. Check what Chrisatronics uses.The windshield wiper motor does need a "relatively" large battery.
That's often the way with designs....they evolve as different contributors think of improvements, or workarounds for problems which come to light. It's what makes electronics an interesting hobby!this is getting more and more complicated lol
You can't finalise that choice until you know which motor you will use.so i need to change the fets to what?