2000 S80 2.9 electrical lighting issue
 

Hello Everyone ,I'm new to the forum and new to Volvo ,I recently bought a 2000 Volvo S80 with 2.9 which the engine and transmission runs smoothly, however a few days after I bought it ,started having issues with the headlights and rear passenger turn signal/brake/tailight ,the passenger rear doesn't seem to have any power have replaced all the bulbs and still nothing, the headlights and all the lights in general blink or twitch while the vehicle is at idle and there seems to be a clicking sound that I cant seem to find coming from somewhere perhaps under the dash area and after a while the car idle will surge as I noticed while trying to figure out the headlight issue,I have to get this thing on the road and hoping its not gonna be too costly,As I've previously stated I'm new to volvo and not any kind of upto speed on quick fixes or electrical issues with these autos.Any advise or help would be greatly appreciated.Thank you in advance anyone.