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The 1-2-All switch would imply the two batteries are isolated from each other, but the short cable would suggest they are connected in series. One of the switch posts may be unused, but a good diagram and description of what you want (eg. batts isolated or not, is one the house and one the start batt and the switch to be able to start from the house, etc) is the only way anyone can debug this thing.

The symptom of working fine and then not at all would cause me to look for poor or corroded connections first. Start at the battery terminals you just installed. Did you clean them all first? Then keep moving backward, look inside switches, etc.
 
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