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Batteries, if "dead" enough or internally shorted may absorb the "boost" current.

Of course I'm wrong but this will hopefully get you a quick answer.

I'd suggest you take the battery out and have it checked... with a "load" on it.

Someone in your area who belongs to this board might come by for a visit...
 

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Discussion Starter #3
Solved the battery boost problem

I put the battery on trickle charge for 2.5 hrs and the engine started. Is it possible that there is some mechanism that protects the electronics in case of an overcharge when boosting?
 
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