Opportunity to upgrade!
The BlueSea comes with a switch that has ON AUTO OFF positions. I installed it under the couch next to the separator- if I need to Jump myself getting under the couch is hardly an inconvenience.
SMB replaced that switch with a wire that closes the Separator whenever your key is in start, therefore the van automatically jumps the batteries every time you turn the key to start. You can find this wire on the SurePower- mine was green, and there is a ground with it. Remove and apply 12v to the terminal to close the separator.
When my SurePower failed it was permanently stuck closed.
Sorry if I'm repeating too much, I know I've posted about this before.