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NOTE Please check whether the item working fine with a 12V power source before installation. Every item had been tested strictly by our technician before sending out. What we would like to assure is the products are qualified and passed by 100% when received by our customers. The defect rate is about 0 when you get the items, except the package is broken during the shipping by the carrier. Please do not judge the quality of our items at your first thought once you find the items is not working normal. Instead of, we suggest you to check whether the installation is correct: whether the positive and negative polarity has been reversed? whether the socket is inserted tightly and in place? whether the wire has open circuit or loose contacts? Beside, If you are not so familiar with the installation of the items, we advise you to install it at the repair shop by the professional mechanics, who can avoid damaging your car during assembling. If you willing to contact us, you can contact us with your order number, your detail problem, your car model and year. CAR ROVER ARE ALWAYS AT YOUR SERVICES!