Cheers Chris. I have tried them on every switched live on the bike. Still do the same I have now left them in the same connection as the ignition fuse plugged them in with a spade connector behind the fuse box.
The grips I have fitted are "Daytona" they are a good grip. They have an OFF..START and ON position. When I put them in the START position the lights dip ever so slightly. Then after they warm up and I put them to ON the lights go back how they were same as if I turn them OFF.
The instructions say this.
"Start" position of the switch must be used only when starting heat,after one minute must shift to "On" position.
Never use "Start" position while riding,but only "on" or "off" postion otherwise grip may be broken
Can be used for 12v Motorcycles.
The part that interests me is this table on the back.
SWITCH-----WATTAGE
ON 12V14.4W
START 12V57.6W (Could this be the reason the lights dip slightly when I have the switch in the start position)?