Just bought an 93 4wd. Having some brake problems brake booster etc. I decided I would gunk my engine as it has years of built up oil. Long story short after i rinsed it off the truck it is dead. Interior cab light is on but truck or dash does nothing when you turn the key. Now instead of a brake problem i have an electrical problem witch i am not very comfortable with I haven't done much yet decided to let it dry and see if anybody might have a good idea of where to start