For that DHH light there's no specific hot/ground. Just run one wire from each bulb to hot and one each to ground. One of the posts about the output is right-the bikes put out about 140 watts, but 100 or so go to charging the battery. You've only got about 40 watts for the headlight/tailight combo. Stock, that DHH has two 25 watt bulbs so you won't get them as bright as you should. Those bulbs can be found at lots of lighting & display stores so you might be able to find a couple of 15 or 20 watt (I would suggest pencil) beams. Careful though; some of these do not come with the protective lens cover.Or you could get some higher wattage bulbs and just run one at a time. Use a switch, try one pencil, one flood beam, experiment that way...