I have a 57 Buick Restomod with a 66 425 equipped with EFI and March serpentine belt system. Cooling fans are dual Spal electric. Battery is an Optima Red Top. So my issue is car starts and runs as it should. System shows that it is charging as it should. My issue is that once the fans kick in at 180 degrees if you shut the engine off and try to restart, the starter acts as the battery is dead……just clicks. After it cools down it starts as it should. Any thoughts as to what the problem might be and/or a solution.