Ford Fiesta Heater Blower Motor Problems

Hi there, I have the following issues with my mk6 fiesta and haven't s clue where to start, the car headlights brighten and dim whilst driving, causing other drivers to flash me, almost like they are flickering, the heater blower motor also...

Heater Blower Motor, Indicators and Electric Windows all stopped working at the same time whilst driving - ie: loads of power available from alternator. Fuses checked and all OK. Another post indicated the same three failing on starting b...