Grounded
I took a closer look at some of the wiring connections on Cornelius, and noted that the main ground strap from the battery to the frame looked tired and frayed.
While grounding is critical for any automotive electrical system, it is especially so on a 6-volt system! Connections must be clean and tight throughout. Also, you need to remember that a 6-volt system utilizes twice the amperage (current through the wiring) that a 12-volt system does, so the wiring needs to be sized accordingly. You can use #2 wires for the starter and ground on a 12-volt system, but you should use #0 for a 6-volt system (no less than #2 for ground strap).
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