Ford Ranger 89 Failure

Good day, I have a doubt, I have a Ford Ranger 89, the problem is that it was working normal 2 days ago and when I wanted to turn it on, I simply do not start, all the accusations light when I turn on the switch and only a small buzz is heard when giving the llavazo, but in itself my question is like knowing if the fault is electric or mechanical and know who to go, I would appreciate a lot of your orientation.