I am a new owner of a Scamp 19, new to me but 1986 model. I have been doing upgrades and plan a new axle before hitting the road. Today was LED tail lights. The lights were three wire but the Scamp is 4wire. After install, it did not work so I had to go back and investigate.mit appears that others have encountered this situation. What I found out was to connect the green wire from the trailer to the blacks. Turn signals, brakes and running lights now work! Hope this help someone out. Looking forward to hitting the road and enjoy reading all the tips and advice on the forum.