if the same buzzing noise happened it means that the wiring was done wrong and the relay was shorting.. probably just mixed up what location two of the wires should have plugged into on the relay

as for your TOD.. DO NOT DO NOT put it in 4Lo unless you are somewhere that your wheels can freely slip (loose dirt, gravel, snow) or you will bind up your driveline.. during everyday driving and even in rain its normal to have 1 bar on the front wheels lit up all the time (except at start and up to 5-10mph, then its usually 0 in the front) to test your tod find a dirt or gravel road and from a dead stop hit the gas as hard as you can and your tod should light up all 3 front wheel bars at least momentarily... if its safe to do so you may want to slam on your brakes after that to let your tod kick in as mentioned in another thread

if i were you, like area51 said... i would remove the relay and reattach the blue wires together, thats what is causing your tod to flash when you disconnect the relay, the blue wire being discontinued... i couldnt tell from the photo whether or not there are any other wires spliced from the harness going into the TOD, but if there are i would recommend reattaching it to the rest of the wires, after that tape off any remaining loose wires (probably your ground and a hot wire, so be weary of that)