The charge rate is determine by the voltage regulator type and which year Mopar car your working on, the early, pre 1971, cars with the point type voltage regulators would discharge at night with the lights on idling below 1000 RPM so the car would run on the battery voltage shruggy scope
In todays world of dual field higher output alternators and solid state regulators that isn't a problem now work
I've worked on Mopars cars that were charging under 13.5 volts at or slower than 1500 RPM shruggy
BTW, what voltage due you consider the "normal charge rate"?

Last edited by Cab_Burge; 05/24/19 05:46 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)