Ok, My Rig is a Damon Intruder on a workhorse chassis.
Symptoms. Turned key to on, Dash lights,. Turn to start all dead.
Discovery: Someone (likely Damon) used standard "Ring terminals" (Crimp on metal rings) instead of a proper LEAD battery terminal. Unlike metals do not do well in an mild acid environment and even though side terminal batteries are not supposed to have that problem... They do.
Cleaned and re-connected and Varoom (NOTE BOOST (Emergency Start) worked)
Did that 3 times before Boost did not work jumper cable off the house did.
Put in a new battery (And terminal) in 2014. been good since.