I bought this at an auction a few monthes ago. It didnt have a key for the ignition switch , but you could start it with the pull start. With it getting colder out, its a bit hard to crank all the time so I figured I would fix the switch. I went to my local Honda dealer who ordered the switch for me at $54. So while I wait for the switch to come in my friend said we could take the key and tumbler apart so I could start it until the new ignition switch comes in. When I took the switch and wiring out, there are 4 wires.....RED, BLACK, BLACK with WHITE stripe and GREEN. The green appeared to be taped off and not plugged in. We charged up the battery and had taken the key and tumbler assemble apart ect ect. Put it all back together and nothing. I checked and there was no power up front so I traced the line back to an inline main fuse and found it was blown. I replaced it and check the front wires for power which I had. I turned the key again and it blew the fuse out. I checked where I plugged the green wire in and unplugged it, replaced the fuse and it didnt blow when I turned the key. I plug the green wire in and it blows the fuse. So I used a power probe and found the green wire is a ground wire. The black is a ground, the black with white does not show power or ground so I figureed that comes on when there is power to starter/key. Does anyone have any idea what the green wire is for? Do you think it could be in the ignition switch, especially since the green wire is a ground and when I turn the key it fries the fuse? Any help would be greatly apprciated. Thanks

 

Nevermind, I figured out the problem myself.

 

Hi! I recently got a Honda Trx 125cc and the fuse kept blowing on me so I'm trying to figure out what was going on with it, plus to get the right amp of fuse because my friend wasted the extras it came with before I could find out what type they were. Any help is very appreciated since I am new with fixing ATVs and such. Trying to have the ATV running hopefully before the month is up

 

The 125 is a fairly rare model. I have never worked on one, but the most common cause of fuses blowing as soon as you fit it is a faulty voltage regulator. disconnect the regulator and fit a new fuse, if it blows the fault is elsewhere. If the fuse only blows as soon as you switch the ignition on, the fault could be in the switch, or further along the wiring system. You have to check each part of the circuit in turn until you find the faulty part. Fuses should be marked, so whatever number is stamped on the blown fuse. If it has a plastic top the colour is the key, for example Green = 30 amp. My guess would be 10 amp or 15 amp.