You do need to ensure the battery is tested under load.
You said you get the 2 dings, does it also give you idle sounds? If so, manually raise the voltage to about 16V and then lower to about 12 and back up to see if you can cycle manually through the resets. You should hear one clink, do it again and see if you get 2 clinks. If you can NOT get 2 clinks or more, then there is a software ID issue. If you can advance the reset, continue to Reset 18 3 clanks and 3 clinks and then press the whistle button until you get a garbled then clear bell. At that point lower voltage to off and back up to 8-9V with in 2-3 seconds . The engine should go into forward at that point. You can contact me via my e-mail. G