Paul -I have a regulator that is a patten part for a DT. You did suggest connecting it to the red/white wire feeding the rectifier. I connected it to the wiring as shown in the US specs (grey wire) but I am not sure if, due to the different ignition and light switches, that it is doing anything. It will be connected to the feed into the rectifier as of later. It seems that when I switch the lights on, the power to the battery spikes. I don't know if this is a bad switch gear although it was a very expensive NOS part. There are now patten parts available so I will get one of those. Mine has the 2 block connections and previously they only sold patten ones with single blocks. Dt - fitting it to the TS. Drewps - I thought you had similar on the tracker. I may become the first 70mph eunuch if the thing explodes as I am thinking of fitting it under the seat.!!