dual extuder heating problem
I have a custom build prusa i3 and wanted to upgrade it to a dual extruder setup. i have a arduino mega and ramps 1.4 board with 2 e3d v6 hotend end 2 e3d titan extruders. i have set everyting up in the firmware and turned all fans of in de firmware because i have them conected to 12 volt so they run constantly when the printer is on. but when i heat up the nozzles in repetier host or server it only heats up the first hotend and extruder (when i heat up the second hotend i get an error that it isn't conected properly). but when i change in the firmware that i have the second hotend conected in the first hotends ports it heats up and when i have ther bed in the port for the second extruder it heats up to so i think the problem is in repetier servor or host because it keeps giving me an error that i havn't conevt everything right but there are no defects in the parts and everything is conected properly. so what do i have to do?