Ok, so I've just installed a sub and amp in the car, along with new front and rear speakers. Since I've installed new fronts, I decided to disconnect the stock tweeters (BA Fairmont). While doing this I accidentally cut three wires that live in the driver side A pillar, where the tweeter is (I thought they were the wires to the tweeter). Upon realising my stupidity, I've reconnected the wires however now it seems the sensor for the boot lid, the sensor for the auto lights (to determine if it's dark or not) and the interior lights no longer seem to work. Not only that but the boot sensor makes the most annoying beep while the car is moving.

Any ideas what has happened/how to fix??

I've tried disconnecting and reconnecting the battery, any idea how to fix?

did you re connect the correct wires together?

Yeah reconnected the wires properly. Found the problem, a blown fuse.

Cheers