I got your PM end005. Everything I wrote was too big to put in one PM and so I'll just post it here........
Well it's no fun but this is about the easiest way to find a short.............
Disconnect the positive battery cable terminal and connect a tester light between the cable terminal and the positive battery post. (be sure the light is the only thing connected to the post - all other battery cables go on the other side of the light.) The light is now the only thing connected to the battery post in series with the rest of the car's electrical (don't try to start the car). The bulb will limit the current so you won't have to worry about any short melting the wires.
The light will grow brightly if there is a full short. An open door will appear as a full short so it should either be closed, or it's door switches disconnected, or the fuses removed that operate items (dome light) caused by an open door (if the light goes out when removing these fuses, that is the circuit with the short).
The light will glow dimly if either you have a partial short or normal devices are turned on (which you should turn off to then see how it glows).
The light will not glow at all if nothing draws any significant current. The ECU and stereo memory do not require enough power to cause the bulb to light up
Then start disconnecting, and/or removing fuses/relays, and/or switching off, one at a time. Start with things that don’t work. Then go to the more suspected things, and everything on that circuit. When you disconnect, or switch off the item that is causing the short, the light will go out.
Keep in mind the short may be in the wiring or fuse box which is harder to find, but first check all the easier, more obvious devices and places. If the light always stays on no matter what item you disconnect, you probably have a short in the wiring. In that case switch off all devices one at a time to see if light goes out. If it does, then the short is between the switch and the device. If you still can't find the short, try removing all fuses and relays in fuse boxes. If the light goes out then start replacing the relays and fuses one at a time until the light goes on (identifying the circuit with the short). If the light is always on, you will need to get a circuit diagrams manual to start tracing and disconnecting wires until the light goes out.