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If you are referring to the emergency start switch - it is a momentary switch - that is, it is engaged only as long as you hold it in the emergency position.
So basically, to start your rig using the house batteries, you hold down the switch, start the engine, then let go of the switch.
There will be a few mSec after you let go of the switch before the relay breaks contact, but nothing significant.
If you want to couple the two systems for longer term - and for charging, etc. then look into the Blue Sea ACR systems that are put on boats. Some of the systems are designed for battery charging only, and some work as an engine start (i.e. they have heavy duty contacts).
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