i found some schematic of driver circuit, and i need advice from someone that knows more than me.
As i can see i need diode across the load, im my case fuel pump that i want to reduce speed.
I want to put that circut so that i cut 12v wire and put it in between, so my mosfet will
switch 12v from fuse box to fuel pump, with potenciometer ill reduce PWM to pump speed
and it will reduce speed and with that pressure will be lower(i hope)
Now my problem is i cant put diode like on picture, i have only one wire that goes to pump
and ground is car chassie that is connected from pump inside fuel tank to bolts inside and its all
connected on bolts that holds fuel tank to chassie,maye a little confusing but simplyfie only 1 wire
goes to fuel pump, and i hope i can PWM regulate it with arduino sketch that works with LED, it dimms.
How to put diode, and what will happen if i dont put it like on picture? Wires to pump is long, around 1.5 M, if thats makes any difference.
Thanks in advance.