Disclaimer - J28 DESIGN INC. will not be held responsible for any damage to, interference with, or malfunction of your vehicle's electrical system resulting from installation or use of the MTPC. Consult with your vehicle's dealer for any questions about your vehicle's electrical system. If you do not agree to these terms, do not use this product and return it for a full refund. If you are unable to use a voltmeter we recommend taking your vehicle to an auto stereo install shop.