Makes sense now, thanks Agronaught. I can see that mine is hooked up wrong or different from previous owner, tho still works, with both batterys are continuously linked until the starter drops below 12.7v by the looks of it. Think I will keep the unit but re-wire it up and use the over ride switch, probably option 3, unless I can work out the benefit of option 2 and having a LED in cab?
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