Yes, it makes sense. The relay delays connection of the house battery until the vehicle battery has recovered from the engine start. This reduces the load on the alternator. At the shut off point of 12.6 volts the vehicle battery should start the engine, no problem. This protects the vehicle battery from becoming deep cycled (discharged), therefore the engine will always start even though the house battery has been discharged.
If you want the vehicle battery disconnected at engine shut off you should be able to "trick" the relay by turning on the head lights or jogging the starter.
Note: my chart shows 100% charge at 13 volts for maintenance free, 12.7 volts for CX & YuMicron and 12.6 volts for convention batterys. From this your relay can expected to remain connected longer for some battery types.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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