Ok. Good information thanks. I thought the black box was a relay of some sort (shows what I know..lol) , so that is the rectifier on these. Non reparable I guess?  It might be time to learn how to use a multimeter. I wouldn't know where to start to test. I do have one though.

Diagram source? Gas Gas USA?

Edited August 19, 201511 yr by sean65

I would first test the AC voltage on the yellow wire entering the thermostat (if this is zero then you have a bad coil)

 

If there is current there, bypass the thermostat with your shorting wire, and test the DC voltage leaving the rectifier.

http://www.trialspartsusa.com/

All the gasgas info and check out his videos on YouTube

A quick check please. My new rectifier has come. This one has a white and yellow wire (as well as the red and black) whereas the previous had the 2 yellow. Is the white wire with bullet connector the earth or thermostatic switch. I really don't want to connect incorrectly and I cant seem to find a wiring diagram with the white wire shown.

Done some reading. I think white is the earth can anyone cofirm please?

I dont know for sure,can you contact the person you bought it from

Yes there technician not in until Tuesday so thought i would check forum