Tracing an active short

[Stonent]

No expensive FLIR to find your short? Here's an easy way from one of my favorite car repair channels using a circuit breaker, a test light and a auto-parts store analog ammeter. In this case, the fuse keeps blowing when you try to start the car.  But where is the short?  The fuse feeds a lot of circuits so you need to know where to look. This guy owns his own repair facility but he also teaches college classes on vehicle repair.

[TheBay]

Interesting video, there are some better ways of doing this however but his method does work.
Though on a modern vehicle I would not be using this method unless you want to replace expensive control modules. I also use a PowerProbe PP3, but you really have to know what you are doing especially keeping away from CAN/Data wires.