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I think a combination of things was the problem. Old battery that would not hold a charge. Jumper cables for 12Volt were used but they are thinner and won't carry the amps required for 6Volt. They did get hot. Ground was definitely poor. But a new 6Volt battery in stock location meant shorter thicker 6Volt cables with cleaner ground and power connections that gave full energy and made that critter pop!
Thanks for all the comments!