First up is an oldie, a 1993 Jeep Wrangler 4.0 liter that is lifted and obviously been repainted at least once in it's lifetime. This shop called me in because of a short circuit. This vehicle is blowing the #9 fuse in the interior fusebox as soon as you put one in and turn the key on. I do a fair amount of electrical issues. I am not always knee deep in check engine lights and drivability issues. Shorts and battery drains are always fun. The first thing I always look for with shorts and drains is aftermarket equipment such as alarms and stereos. This vehicle has an aftermarket stereo. A quick unplug of the stereo and we still have a short. So we can cross off the aftermarket equipment. Next I pull a wiring diagram and get the "lay of the land" of the circuit.
I loosen the holdown and swing it to approximately 4 o'clock. Lets see what our scan data shows and then we can fine tune it with the scope.