The large finned box is the Rectifier/Regulator (R/R)...the little finned box is the blocking diode.....they should get warm, but not hot..... When R/R goes away the scoot still runs but it is not charging the battery. My scoot has a 6 wire R/R, which I had to replace a few weeks back. My battery would not charge and the rear stop/turn would not work.
All is good now.....My scoot has a volt meter and it shows 13.4 with the HID's and everything on and going down the road. When my R/R went the volt meter just showed battery voltage which was 11.3 with the engine running....
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