i asked about turning my triumph trw from 6 volts to 12 volt Ian gave me most of the information but there a couple of question i would like to ask the bike is a positive earth will i need to change this to negative earth and is the rectifier the black thing under the saddle that looks like 4 washers bolted together with 3 wires going to it and have to be replaced with a Zennor diode thanks roger
