IF YOU WANT
You can make your own test light all you need is a old 12 volt car light and extension cord ((make sure its 12 volts)) most light have two places to connect a wire strip the extension cord and connect after that ground either wire to the car body and the other wire is use to see if the wire in the car is hot if it is hot it will light the light up if not it may be a ground ((but remember some wires are only hot while the key is in the on position)) ther you go light lights up its hot if not its not ((to make your own test light i would prefer a old headlight from a older vehicle square or round ones whole glass lights
