It doesn't sound like a voltage sensing. And since I dont have my ingram catalogue at home...
But, there are other methods you can use to wire it in, apart from ignition switch and whatnot. If you do use the ignition switch be sure to pick the ignition supply that cuts out on crank, otherwise the solenoid will be in while cranking (leading to overheating of your cabling if your primary battery doesn't have enough to start the vehicle). As well as the draw from the second battery drawing from both while cranking.
Forgive me if I'm stating the obvious.
Dont forget to fuse/circuit breaker anything from your secondary battery! Preferably twice, once at the battery, for the large cable, and then again where ever you add accessories! If you're anything like me. I have a cable run the length of my Rocky, all the way from battery to trailer plug. Any accessories, like radio, cb, fridge outlet etc etc are fused where they come off this cable. That way when one has a problem it doesn't effect the rest.





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