Well if you hooked everything up correctly to a 12 volt source I would say it's your converteror or your on and off switch might be defective . Also try troubleshooting by hooking up one gauge at time to your converter to see it they work individually if you believe it not the converter or switch. Let me know what you find out. Soundz like Pimp gauges .com has ghetto customer service. Make them ho's do there job and serve you correctly Playa or send thier faulty product back and demand a refund. Good luck.