russ dud

hi all, i have a 1944 mb willys and got it nearly finished its all been rewired , new earth straps, i put on a new battery to try the lights all ok pulled the switch and got all lights working but one front offside blackout not working, so i took battery off messed with the light and put the battery back on as soon as i did a buzzing noise come from the CR, i have not tried to start the jeep yet can anyone enlighten me please,thanks, stay safe 

i have a 1944 mb willys jeep and finished putting it all back together rewired it and put the battery on to try the lights they all worked but one blackout offside i disconnected the battery then reconnected it but the middle unit on the regulater started buzzing and got warm can anyone help with any info what could be the problem thanks