I just installed this in mine.
View attachment 459290
Just did the same install on my 2021 RAM 6.4 hemi
I grounded to the IBS terminal where you can see the #4 negative wire to the DC/DC charger in my camper. The truck has been sitting for two weeks and when I connected the NOCO Genius2d I got the slow pulse red, which says SOC was <75%. I measured 12.6ish volts. .
-----I'll check again after three hours-----
I'm now getting 13.49v
After reading the tiny instruction manual it says a 12v 40ah battery can take 10 hours to charge from 50% DOD (depth of discharge). My build sheet says I have a 730 amp battery (Snowchief, dual alternators). But I don't know what is the amp hour rating, and can't seem to locate it in the manual.
-----Checked again the following morning---
Red light was still pulsing! Maybe the 730 amp is a 73 amp/hour battery?
In which case it could take up to 20 hours to bring from 50% SOC.
----Checked again in the evening, approx 27 hours after connecting---
Green light pulsing, which means 75-99% SOC
That's better. Hoping to see a solid green light next
I was shocked my batter was so low, and hope this will take better care of our RV, which stays put for chunks of time.