My (recently purchased) 1989 F250 Diesel frequently "buzzes" when I try to start it. Sometimes it just turns over and fires up as normal, but at other times it makes this loud buzzing noise over and over again without starting up.
If I keep turning the key, it seems, sooner or later it will stop the noise and start the engine. But it seems to be a random thing. Could be the third try - or the hundredth.
Does the starter/solenoid need to be changed out? Where is that located in the engine compartment? How tough is it to do-it-yourself?