Okay! 2008 FLHTP! Voltage would drop steadily and drastically, after the bike got really warmed up. I guessed, bad battery, so I bought a new one and installed it. Took it for a spin, same problem! (glad I spent that $140.00) Then I wised up and got some advice from my parts supplier/repair shop guy, (HD competitor and ex employee) and he advised me how to test the voltage regulator vs. the stator. Eureka, Voltage Regulator! So I run the voltage test to eliminate the stator, (purchased the V R at H D, only because I had a $50 gift card for there, broke my heart to do it too) and change the regulator following step by step in the service manual, ($195 more) ugh! Now the bike runs great, voltage gauge reads 14v, but engine light comes on after a ride. I check the DTC's and get p0113 (IAT sensor voltage open/high EFI) and p0562 (battery voltage low) Why?
Unfortunately, I do not have an Electrical Diagnostics Manual, (yet) so I'm praying someone here can lend me some advice. (cause I'd feel like a "user" if I go back to my guy regarding this again) Help! Please!