No dielectric grease , starter motor sealed with silicon mastik the stuff used on window frames and door frames, alternator mounted high up as possible , I rinse the alternator with clean water if it has been through muddy puddles but if it is just river crossing i leave alone ,,,, had to strip the alternator down a couple of times over the years . The engine is a diesel so no electric to speak off really. All the other chassis electrics i just rinse of with thresh water as soon as ..It is muddy water and thick mud that seems to cause most problems ... derkiow