Had standard regulator go on my 2006 super duke ,so changed it for a uprated mosfet one about 2 years and 4000m ago , and put new battery on , but today it let me down battery drained and regulator not charging the battery ,any one have any ideas what to do next , try another mosfet one or is there any other Thing I could try ,battery is ok had it checked ,

From where did you buy the Mosfet?

Cannot remember who I got it off came off eBay was about £100 ,it’s the same as the ones advertized now ,

I read that there are/were some fake Shindengen R/R's out there, maybe yours was one of these?

Better regulator. People have had great results purchasing from this guys.