[_ogre]

check your voltage, you may not have a voltage reducer and have possibly moved a wire from 16 volts to 24 volts (assuming 6x8 configuration) or 12 to 24 volts if running 4x12.
i run led lights rarely and a horn on 2 batteries, 16 volts. my led lights are 9-24 volts rated. even a filament bulb should be ok at 16 volts for occasional use, as a car alternator runs 14+ volts. i've run this way for 10 years without any nefarious affect on the batteries