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Hello, my 1500 has melted the light switch. The front lights P reaches 7/8 volts. At the front light 13 volts. If I join the wires of the light switch the wires get hot. Also on the license plate light there are 8 volts. Sorry for the Google translation

You seem to have a partial short circuit or a connection to something that shouldn't be on that circuit. Try taking all of the bulbs that are only getting 8 volts out and see if the voltage goes up. While this likely won't work it's worth a try to make sure it's not just a bulb in wrong. I am assuming that there hasn't been any work done on the bike that could have caused a problem and if so then you will just have to try to isolate a reason for the excessive draw. Try disconnecting the two large harness plugs that are under the seat to disconnect the rear lights and be looking for any sign of overheated wires at the connectors or anywhere.

thanks, tomorrow morning I'll try

I disconnected all 3 plugs, but nothing. I disconnected the 2 plugs on each side, 2 left 2 right next to the radio but nothing. Disconnected the fog lights but nothing. Both in front and behind the P bulbs arrive 8/9 volts, and the switch voltage leads are hot.

Well this is where things get more difficult, you are going to need to separate the lights from everything else. Remove all of the fuses other than the one for the lights and using a test light probe to see which side of the fuse holder is the hot side and then check the other (recieving) side which should be dead without the fuse in to power it and see if there is a circuit that is hot when it shouldn't be. All we know right now is that something is drawing a lot of power and it is happening after the light switch which is why the switch is getting hot. Since disconnecting the rear lights didn't change things the issue is likely in the front half of the wiring. Be watchful of any sign of damaged wires that could be shorting together. I hope that it goes well for you, this type of thing can be hard to find and fix.

thanks, hope to solve