I have a TW200, and I am wiring a usb port with a voltage read out. The only way to get a accurate reading of voltage is to connect to the battery directly. Testing with the low beam wire that comes on with key switch, the voltage is 1V lower than the battery. I don't want to wire directly to the battery and have it slowly drain the battery.
Is there a way to connect a switch that will only let the power wire to the battery draw power when the accessory wire gets power so that it is still connected directly to the battery but only on when the accessories are getting power.
idk if this makes any sense or a better way to go about it.