I've got a 3dr base model shell and i've got the electric window harness from a 4i and as far as i'm aware it should plug in to the main car loom. What i'm unsure about though (as i havn't got the dash out yet) is that i have two plugs that i'll been told plug it to the loom, the 1st plug has a red positive wire coming out the back which then goes in to the bottom of the second plug which is about and 1 inch away. Then on the second plug it has an earth wire (black and yellow) coming out which goes down to the window switch's. What i can't understand is how the system gets it live feed and thats why i thought the black and yellow wire maybe be a switchable earth.

What do you think? Sorry for my poor explantion.