The unit in my 2007 US 990A failed to start today. The accessory socket reads 12.56 volts with the key off and 11.95 with the key on and the headlight off. (Euro headlight & Switch) 21 months seems short lived to me... What life are your Orange Monster batteries getting?
I will check the battery drain test tommorow. i.e. disconnect battery neg and measure current to ground. Manual standard is 2mA or less. Otherwise I have current drain somewhere.