I took a relay out from the upper fuse box at the steering wheel today in my p reg 1.6 sx Bravo. When I tried to put it back in the headlights came on and the heater came on when I turned the light switch. Can anyone tell me what this relay does? and whicg way to put it in!! Its Black 20A and has the number 7676504 on it. Even if someone would put a photo on that would be great. Im at my wits end!!!