My 07 SM was having battery charging woes, traced to the OEM R/R as the likely cause. This was probably going on for some time.
The OEM Yuasa battery that I replaced is doing fine holding resting voltage. I'll reuse it in my riding mower.
IMO, the OEM R/R is junk. Plain & simple.
I don't know what idiot routed the OEM wiring from the R/R to the main wiring harness, but it looks like one literally has to drop the engine from the frame in order to remove the OEM R/R and keep the connector intact. Piss on that. I cut the connector off instead.
Here's the Rick's replacement & the OEM R/R side by side: hint - the OEM has the connector cut off


Rick's unit mounted on the bike:

New wire routing:

New wire bundle is zip-tied to other wiring bundle to keep it in place.
Bonus tip: pack the new connector with dielectric grease. "Spark plug boot grease" works also.
Voltage is now stable & where it should be.
