OK men – I discovered a 4 terminal regulator off my Super H in the toolbox on my truck this noon. So I opened it up for peek inside during my lunch (I’m at work…). Here’s the deal:
The L terminal connects to the HIGH (input) side of the current sense coil. Thus the L terminal is hot at all times.
Note that under this arrangement with the engine stopped current flows “backward” thru the current sense coil when there’s a load on the L. This backward flow however affects nothing since the generator is stopped.
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Bob -
I agree - to a point anyway - with your 2nd statement: It does not make sense to bypass lighting current around the sense coil and risk overloading the generator from excessive load current.
But a 3 brush generator is by design inherently self-limiting for current output. Ie. the setting of the 3rd brush determines the maximum current the generator can supply, even under dead short conditions. (Theoretically anyway…I’ve not tested this for obvious reasons!)
I cannot however think of any possible advantage WHY a 4 terminal VR is wired like this.
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