Fuse 9 under the seat is 20A and controls "Front audio system amplifiers, front doors" according to the handbook.
It first blew a couple of weeks back. The door winders and fobs suddenly stopped working. I replaced it and it was OK for about a week. Now it repeatedly blows again and I have been unable to trace what is causing it. I fit a new fuse, turn the ignition on, and the window winders, locks and radio all work again. As soon as I start the engine, it blows. Is there anything else that runs through fuse 9?
My HEVAC central LCD panel is also currently off and I don't know if this is related. The switches light up ok but no display. I swapped the panel for another spare (but an early one) and it doesn't light up either. I swapped them back and tried unplugging relays under the bonnet related to HEVAC .... heater blowers, aircon clutch etc. Still blows.
Disconnected radio leads. Still blows. I have also added a few things to the wiring over the years ... a switch for the aircon fans (wired through a relay anyway) and a USB connection/Hella charging panel in the back. Disconnected all the leads. Still blows. Running low on 20A fuses, I fitted a 30A fuse. Still blows. Plugged in a diagnostic current measuring device that you plug into a fuse socket and it went off scale and blew the fuse in the device.
Turning the ignition on, everything seems fine. No short circuits. No blown fuses. Start the engine (diesel) and it blows with a pop. Any ideas?