See the last part of this regarding the starter relay.
North Eleuthera And Back To Our Old Stomping Grounds Of Abaco! | AtAnchor.com
Bahamian mechanic believes that the Lugger starter relays may have internal diodes that manage power flows on an isolated system, where regular relays do not.
Above my pay grade so will let my Jax mechanic work it out!
My lesson learned is that, when I do the engine room check, I get myself over the top of the engine and look at the outside for tell tail leaks that don't necessarily show on the bilge diapers!