Hi Norm,
I have an older (Dec 1980) B&S manual...it shows multiple types of alternator. Regulated, unregulated, AC, DC, AC +DC, and combinations thereof.
22 pages on alternators alone, and that's pre-1981!
Do you have an idea what the alternator does? Just run lights, or charge battery, or both?
No actual voltage is really listed, but if it is the AC lights-only type it says a test lamp should achieve 'full brightness' at medium speeds on thendual circuit (lighting and charging) type.
Lighting only AC type is probably 8V at 2400rpm and 12V at 3600rpm for 70W load. Load lamps should be a sealed beam unit. Now the older American car ones were 12V 37.5W I think but may be 55 to 60W by then. It says load should be 60-100W, which makes sense for 2 x 37.5 headlamps = 75W. This is a 5A alternator. So says the manual.
Otherwise I will guess the unregulated stator output under a load should be roughly 12-14V multiplied by the square root of 2 to take account of the AC factor. I think! So expect somewhere in the 12-18VAC range I think. 12V system.
What exact issue are you trying to solve, I may be able to help from the manual further?
Last edited by Pitrack_1; 29/03/16 09:04 AM. Reason: Clarifications
