I bought one of those musical horns/PA systems. I'm tired of having things professionaly installed because it cost too much so I've started doing it myself, however I've only stared doing it myself so I don't know much about it. The horn came with an adaptor that I could stick into my cigarette lighter for power, however I don't want to have to plug it in everytime I use it. So I'm assuming I need to cut the cigarette lighter adaptor off. What do I need to do to to give it power?