[terence123cars]

As an old electrical technician I suggest a troubleshooting technique that will probably help you narrow down the problem area. Remove fuse in question and connect a pigtail socket with a high wattage, 12 volt bulb in it. You could use a blown fuse to connect the pigtail socket wires (# 16 Gauge wire would be good. What you will be doing in effect, is to put the lamp in series with the load on that particular circuit. The lamp will glow to it's full brilliance if there is a short circuit on that particular circuit. For instance, if you were testing your interior light circuit, the bulb would glow at a less than full intensity if there was not a short (the lamp would be in series with the load) and the interior lights would not be at full intensity. If however there was a short circuit in the intrerior lights, the pigtail lamp would be at full intensity.