The other day I plugged something into my van's powerport. The power instantly went out of the port, and the radio died as well. Must have blown a fuse. I looked all throughout the dashboard, underneath, the sides, etc. No luck. I checked the manual, but it wasn't very clear either. Oh, come on, I have a drive to make the next day!
Finally, out of sheer frustration, I pulled into a Dodge dealership. At the service area, I explained my problem to the office manager. She sent out the head of the shop to help me out. He spent about 5 minutes looking over all the same places I did. Then he popped the hood. Right next to the battery was this black box. Popped the lid off of that, and there were the fuses. We looked at the map, and found the right fuse, and it was blown. I got two new fuses (the spare was missing) and installed one of them. Everything worked fine. (I tossed out the splitter that caused the fuse to pop. Never did that before, but don't want to take any chances.) The service manager wished me well (and no charge, except the fuse) and I was rolling again.
I guess I'm still used to older technology. I never would have thought to look under the hood for a car's fuse box!