It's been my experience when using the 420 predator that the charging system sucks. Since I build street legal motorcycles with this engine I'm limited with how much power I can draw from the main battery. I figured a simple way to power the main headlight is to use a rechargeable battery that's waterproof durable and long-lasting. I bought a LED light from Harbor Freight and tested it using my 24v Kobalt cordless battery. I ordered a piece that slides over the Kobalt battery that has two wires exposed so you could power whatever you want. I hooked up the headlight on a full battery that had four bars lit. And ran it straight for at least 1 hour and 45 minutes. I'm going to mount the battery holder under the seat and I will carry to full batteries that should allow me to drive at night for as long as I want. I could have gone longer on the light but I didn't want to drain my battery completely, it still had one bar lit when I disconnected it