I have a project that uses the arduino uno to control a 12v car windscreen washer pump, which I've tested at 3.8A under load. It works using a 10A relay, but I'd like to replace the relay with a mosfet.
Having done a bit of digging (I am new to electronics), I've found that a N-channel mosfet (RFP12N10L) would do the job. Looking at similar circuits on the web I've noticed that a diode is placed either across the motor connections or connected at the Mosfet. Can someone clarify what the best approach for this is please?
I'm assuming that I'd need a diode rated high enough to cater for the 3.8A load, so would a 6A diode like this: http://www.ebay.co.uk/itm/350819432740?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 be a good start?