Sorry for delay, daughters boat and was waiting for a replacement ignition amplifier to try and see if that was issue (it is not). In answer to the question regarding the purple wire, if you are talking about the purple wire that feeds one of the connectors on the amplifier, there is 12V at the plug. In regard to the red/white wire, with the key on, wire connected and using my test light, the bulb is very, very, very dimly lit. Almost like something further on(ignition sensor? distributor) is shorted, however, if I disconnect the red/white wire I still don't show 12v on the open end. ?????