Definitely check both of your battery cables first.
If that doesn't work, check your major ground connections. This can be tricky, and you'll need an electrical wiring diagram.
I had both problems, at different times, on one of my old cars. Each time, the entire electrical system was dead.
If that doesn't work, check your major ground connections. This can be tricky, and you'll need an electrical wiring diagram.
I had both problems, at different times, on one of my old cars. Each time, the entire electrical system was dead.