![]() ![]() The Busch + Muller IQ-XE has a pair of 20 gauge wire leads for its power supply. I don't have a full DIY for this since I wasn't even sure it would work when I started, but here are the general steps: Headlight The headlight installation is the easiest part of this project. If I had to do this again, I'd get a better stripper for the inner wires than the one I had (I ended up having to delicately use the Fluke stripper linked above to cut the insulation from the inner wires). The wires within are a particular pain to strip so give yourself plenty of extra length for trial and error in case your strippers are too tight. Some adhesive-lined heatshrink tubing and soldering gear along with a heat gun (or other way of shrinking the tubing) were necessary and you'll also need a multimeter, good conventional wire strippers but also something like this round cable stripper to get through the thick outer insulation of the Julet pigtails. For this project I needed a 2-pin male and a 4-pin male for the headlight and taillight respectively. I found a company that stocked pigtailed Julet connectors (the snazzy connectors used on the Radwagon 4 and, presumably, other ebikes) and you can find that here. The challenge was finding a way to rig them onto the bike without cutting the factory harness (I'd reached out to Rad and their official response to my wanting better lights was to get a second handlebar-mounted battery light.so no). The IQ-XE was clear enough in its compatibility but the Line K Brake taillight was a bit of a mystery (though now it seems the power rating is on the website clear as day). ![]() Now the main confusion I found was on confirming whether the lights would operate on the apparent full 48v current supplied to the Radwagon's light circuits. I had good experience with my Busch + Muller taillight on my manual utility bike and decided to go with their products for both taillight AND headlight. Sure enough the headlight was almost horrifically underwhelming for a bike that can hit 20mph easily and the town I live in has very sparse street lighting to boot. I picked up a new Radwagon 4 this spring since I currently am not driving and needed something that could do everything (on a budget) but I knew from the start that the OEM Spanninga lights would likely be a problem after reading reviews and talking to a friend who had bought a Rad Mini. ![]()
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