Wait, what do you mean the battery's dead?

[Niall]

The loom Jonny is talking about is actually the engine fan loom.min particular, the plug. If your looking at the front of the car, the plug is on the right of the radiator and fans. It's a round plastic plug and if you unplug it, you will more than likely find corrosion on the pins. Give them all a bloody good clean up, wd40 them and plug it back in. Then cover the plug in white grease. It will look messy but will keep moisture out.