Renault megane coupe cuts out when i turn on lights or wipers?

1998 Renault megane coupe , had the car 1 year with no problems until now. Started it and it cut out when i went to drive then when i tried again the immobilisor would not dissarm . tried the next day and it started after 6 attempts dissarming immobillisor . it drives ok but when i turn on the lights or window wipers the engine cuts out and the engine management light comes on and inside lights flash and fusebox buzz,s . ive checked all fuses and i am lost at what to try next , any suggestion on this problem