I've been using the Silverstar Ultra for a few weeks now, not had any wiring issues that I know of and gives off noticably more light. The literature says H4 compatible or words to that effect and is the same 60/55 watt rating as the OEM bulb. I can't see there being any problems with wiring if the wattage remains the same. My concern with the Ultra was they may not last long due to the vibrations and bumpy roads. So far so good but they're not cheap, 69.00 dollars for two at Canadian Tire. Good luck.I've been pondering the idea of putting on a led auxiliary light on the 98 tw. Anyone on here used the advmonster.com LEDs or have an led headllight? Been thinking about one model 30 which is a 1500 lumen 10 watt or one of the 44's which is 2000 lumen at 24 watts I believe. I have a single led 200 lumen headlamp that I use for caving/hunting and it's amazing how much of a difference it makes at night. If I don't do the led auxiliary light or led headlight I'm might just try out the silverstar and see if the harness doesn't melt. I did do the switch mod so I can turn of the light if not needed.. Oh another question. If you run the switch in the middle with the stock bulb I'm guessing it's putting out 70watts? I have done this at nights few times on the tw and alot on the sv with no dead batty or melting. Input and ideas are welcome.