you don't, it's internal sensing, doesn't need an external "user" (ie the light)
Marck, beg to differ.....they tend to go to no output at idle....
but that is obviously load and RPM dependent....
:flash:
What do you mean? A 1 wire alternator is internal sensing, not external. There is no way to wire up the gen light, which on a normal alternator is the load required to excute it. Also, the 1 wire alt won't charge at idle after starting. One blip of the throttle and it will start charging.
How do you propose we wire up a gen ligth w/ a 1 wire system?
On this side of the pond, the SI series alts from GM were widely used on boats and as such were modded with external shells on the backside with metal window screen fine mesh material in back, and same inserted in front inside the front shell....I modded such alt for my Volvo powered boat some 20? years ago when the Volvo alt shit and it was 50 billion bux for it....so my Marina owning old neighbor buddy told me of the GM alt and what to do, so I got the screens from his parts dept....
and one of the mods was to take the output stud directly to the typical RED, or MOST clockwise viewed from rear , regulator pin....and you are correct in that the least clockwise pin was unused.....the rear screen/cover he sold me did not have any holes for any wires to the regulator....
And so I did have to rev the engine to about 3k to get the alt to charge, but idle was like 800+ rpm so no sweat....it always charged....
now on any other vehicle, over the years, the one wire always had a problem dropping out at idle....defined as less than ~800 rpm....like my big Pontiacs, and any milder engine....same behavior the motor home with the CS144 exhibits....at idel under a heavy load, the alt will drop out....it has a idiot light but no ref signal....maybe I need play with it a bit....decrease the load resistor to the 'L' terminal.....
NOW in the last few years a buddy with a 350 chebby in his Chaparral ~22' boat we put a SI alt on it, he bought the alt from a boat source, and so it came with that back cover just like my old one, BUT has the regulator outputs fed through the blow screens and so I hooked it up via same as a car....and it does NOT drop out at idle which for him is less than 700 rpm....
My conclusion is that IF idle speeds under full loads are up around 800 rpm or so, that one wire alt is fine, if under that, and the rpm maybe vary a tad, it will drop out and it's load dependent also...proved that one myself in the vette....:ghost::friends::flash: