Hi,
today i fitted my aftermarket head unit in my new car, a ford focus. Its the same aftermarket head unit i used in my old car and i had no problems. After i fit it today it worked fine. About three hours later i went back out and the car started but choked a little bit. Another three hours later and ive gone out again to find that the electrics seem to have gone. The car wouldn't start electric stuff like the interior lights, stereo, dashoboard lights etc came on and went off and there was a faint thud sound and then everything went. There seems to be a little bit of life in it but theres definitely a problem with the electrics caused by the head unit fitting...

I'd be greatful for any help please!!!!

Cheers