my cigarette light is broken, I believe. It won't heat up cigarettle lighters, and won't give power to my phone charger. I have no idea what the problem could be, although I imagine it is electrical. Does anyone have any advice? It's annoying, and I want to fix it (i might invest in a GPS, which is pretty useless without a power source) but i'd hate to take it to a mechanic if its an easily fixable problem.