Hi guys, seem to have nothing but problems with the Fourtrak at the moment!!

Just sorted the radiator issue, and now it wouldn't start this morning. Moved the ignition round for the glowworm to appear and the lights were flickering and a clicking/sparking noise from under the bonnet. It felt like it was coming from a small rubber capped metal motor type thing next to the battery (see the circled item in the diagram below) although not sure what this is?

Could you advise as to what it's likely to be? Not sure if this is the voltage regulator or not.

Thanks!