To start a real diesel,just turn the key.If its real cold,plug it in,or hit it with a shot of ether.Direct injected truck engines do not need glow plugs.The reason to have a diesel is reduced maintance,these glow plugs always give trouble at some time,and go bad randomly,then you have an engine that starts hard ,runs rough and smokes bad til they all fire eventually.The controllers go out frequently too,since they pull upwards of 50 amps while heating.I know Ford uses 6 volt glow plugs so they heat up quick,this makes them fail prematurely.The Cummins in the Dodge pickup is the only truck you can hop into and just hit the key,and it starts perfect.It does have a wait light,but its just an air intake preheater,not neccesary,in fact its Dodge spec thing,same engine in a motorhome of freightliner doesnt have it.