The 4-terminal setup effectively removes the load wiring between the VR's BAT terminal and the ammeter. This takes load current and it's associated voltage loss out of that piece of wiring (actual wire length/voltage drop depends on the VR's location).
This results slightly less voltage drop between the ungrounded battery terminal and the VR when the lights are burning. Ie. the VR senses voltage at the battery a bit more accurately and thus does a better job of charge control when the lights are on.
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We're contemplating a visit to Red Power this year. A joint sparky seminar there might be kinda fun - unless we get lightning/rain/wind like you did at the Canandaigua Expo that is!
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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