The bike in question is a 2004 SV650S with ~22,000 miles. I apologize for the length, but I'm trying to be thorough. Try not to fall asleep. Basically, I've been trying to diagnose what may be an issue with my charging system. What lead me to look at it was a stalling issue about a week back that had me limping home. The issue is VERY intermittent (I can go months without an issue, and it will randomly rear its ugly head again) so I finally decided to try to figure it out. Reading around, my intermittent stalling may be a flaky TPS so these two issues may be unrelated. However, figuring that out and probing around revealed a potential issue with my charging system. For reference, here is what the service manual says I'm supposed to expect with regard to voltage: Voltage at battery terminals @ Idle: Not specified (users report the low 13's with stock R/R) Voltage at battery terminals @ 5K RPM: 14.0-15.5 Vdc (15 and above is rare) Voltage at stator leads @ 5K RPM (cold engine): greater than 60 Vac Resistance at stator leads: 0.2-0.7 Ω There is also a table for performing a diode test of the R/R, but you guys will have to just trust that I performed those tests correctly, the unit passed. Stator voltage and resistance tests were all within spec:61 Vac/60 Vac/61 Vac and 0.3 Ω/0.3 Ω/0.4 Ω respectively. It also showed no continuity to ground. On a freshly started bike, all of my measurements fell within the spec. Here they are: Voltage ignition off: 12.9 Vdc Voltage at Idle: 13.1 Vdc Voltage at 5K RPM: 14.4 Vdc However, the problem arises once the bike has come up to operating temperature, and has been there for some time. This was with the stock R/R: Voltage at idle: 12.6 Vdc Voltage at 5K RPM: 13.0-13.2 Vdc I originally figured there might be something funky going on with stator output as things heated up, but I tested it, and I was still getting around 58-60 Vac. There was a slight drop, but from what I understand, it's to be expected as it warms up. Since I had a known good battery (brand new Yuasa), and stator output was good, I looked to the R/R. Even though it passed the couple of tests I could do on it, I figured there may still be something funky going on internally with the regulating protion, and these shunt-type R/Rs in SV's aren't known for being robust. So, I wired in a MOSFET-type FH008 from a 2006 CBR600RR. This unit is probably one of the most popular replacement models for our bikes. However, my results were still the same. Good output on a cold start, but once the bike has been warming up for a while, I'm rarely getting much over 13.2 Vdc or so at 5K RPM. Results were about the same as my above test with stock R/R. Any idea what's going on here? What drop, if any, should I show at the battery terminals with regard to voltage as things start to heat up? I thank you all in advance for your time; I could really use the help as I'm stumped.