YOU CAN USE A 12V REG/REC & BATTERY WITH THIS COMBINATION (MUST CHANGE ALL LIGHTS).... OR USE THE 6V REG/REC AND USE THE STOCK BATTERY AND LIGHTS....PIC SHOWS 12V... BUT JUST LEAVE THE STOCK BATTERY IN FOR 6 VOLT NOTE!! the yellow wire coming out of the reg/rec never has it's own power,, it just "T's" into the yellow wire that comes from the engine's stator wire, that then goes to the headlight dimmer switch. it takes excess voltage and delivers it back to ground. thus the regulator part of the regulator/rectifier. SUB-W-12/12/6/6 (S1255) FOR TRIKES/BIKES WITH OR WITHOUT LIGHTS, BUT A BATTERYNOTE!! the yellow wire coming out of the reg/rec never has it's own power,, it just "T's" into the yellow wire that comes from the engine's stator wire, that then goes to the headlight dimmer switch. it takes excess voltage and delivers it back to ground. thus the regulator part of the regulator/rectifier. @ INSTRUCTIONS SUB_W_12/12/6/6 ON_CT70K0_HK0PIC SHOWS 12V... BUT JUST LEAVE THE STOCK BATTERY IN FOR 6 VOLT @ 12 VOLT REGULATOR RECTIFIER COMBINATION UNIT (214W) (S1070)NOTE!! the yellow wire coming out of the reg/rec never has it's own power,, it just "T's" into the yellow wire that comes from the engine's stator wire, that then goes to the headlight dimmer switch. it takes excess voltage and delivers it back to ground. thus the regulator part of the regulator/rectifier. S1070 @ 6_VOLT REGULATOR RECTIFIER CONVERTS_12V CLONE_ENGINES TO_6_VOLT!! KEEP_ORIGINAL LIGHTS_BATTERY (6V_reg_rec) (S1249)THIS WORKS EVEN IF THE PIGTAIL COMING FROM YOUR NEW ENGINE HAS 12V MARKED ON IT !!!! WITH THIS YOU CAN DO AN ENGINE SWAP AND STILL KEEP THE ORIGINAL 6 VOLT LIGHTS HORN BATTERY AND WELL IT JUST MAKES THINGS EASIER!! WITH THIS REGULATOR RECTIFIER YOUR BATTERY WILL STAY CHARGED MUCH MUCH BETTER THAT WITH THE ORIGINAL HONDA 6 VOLT SYSTEM,, AND THE HEAD LIGHT IS MUCH BRIGHTER TOO, AS THERE IS PLENTY OF JUICE EVEN AT IDLE WITH THE NEW TYPE STATOR THAT THE CLONES HAVE. THIS ONE ITEM CONTROLS THE HEADLIGHT VOLTAGE (AC 6 VOLTS) TO KEEP THE HEADLIGHT FROM BURNING OUT,, AND IT GIVES THE BATTERY PLENTY OF 6 VOLT DC TO KEEP IT FULLY CHARGED AT ALL TIMES.. NOTE!! the yellow wire coming out of the reg/rec never has it's own power,, it just "T's" into the yellow wire that comes from the engine's stator wire, that then goes to the headlight dimmer switch. it takes excess voltage and delivers it back to ground. thus the regulator part of the regulator/rectifier. 6V/reg/rec (S1249)