Install an amp gauge in your car and you will instantly know the general condition of your vehicle’s electrical system. Also known as an ammeter, this is one of the instruments that has largely been replaced with an idiot light. Without it, you will not know there is a problem until it is too late. The amp gauge tells you, at a glance, whether the system is charging and may allow you time to effect repairs before you get stuck in the middle of nowhere. Auto Meter is one of the more prominent manufacturers of after-market automotive gauges.
Use the wiring diagram and test light or multi-meter to locate the positive wire from the alternator to the fuse block. Then locate any wire that has power with the ignition off. Use the flashlight or drop light to see the wiring under the dash.