Arthemius

And with a relay you mean a simpel on and off switch hidden somewhere? And hooking it up directly to my battery won't discharge the battery overtime? I'm scared I'll end up with a dead battery far away from home

Yeah I'm sure I connected it to the fuse box. It looks like this: http://www.triumphrat.net/memberalbums/data/1309/medium/fusebox_-_no_labels.jpg And the charger normally is good quality. I bought it from a local store. It also can handle volts from 10 to 18v. Do you think reving the engine can cause a spike that big? Wouldn't it damage other components of the bike aswell in that case? Anyway, I have seen lots of people charging there phone from their bikes, even when they are riding. I just don't know how they do it then.

Hey there, I wanted to be able to charge my phone whilst riding so to never have an empty battery. I also wanted it to only charge when the bike was on. I have succeded in this. I used a female cigarette lighter used in cars. I hooked one wire to the frame of the bike and one to the fuse box. I checked which ones gave power only if the bike was on. I then put a usb charger in the cigarette lighter. When I hooked my phone up and turned the ignition, it started charging. But from the moment I took off, it stopped. I then began testing and found out that when the rpm goes from stationary to around 3 to 4000 it stopped charging. I now am thinking this is because there is an overload that the usb charger just won't allow and therefor it will no longer give electricity. Do you think my hypothesis is correct? If so, what can I do about it? Or if not, what can I do about it? Or you can suggest an entirely different approach aswell. Thanks in advance!