Are you suggesting a trickle charge in case the ignition is not turned off then?
Yes, exactly that. The process to put the truck in neutral tow (as you know but others may not) is to:
- Connect the truck to your RV with a suitable tow bar
- Enter the truck and without pressing the brake pedal, press the start button to put the truck into accessory mode
- Depress the brake pedal and shift to neutral
- Rotate the drive mode knob from 2H to 4L and back to 2H, 5 times in 10 seconds. The transfer case will shift into neutral and a confirmation dialog will appear on the console cluster
- Remove your foot from the brake pedal and press the Start button to turn the truck off
If you don’t perform step 5, which is very easy to do because the engine is not running and there are very few queues indicating the truck is in ACC mode, the radio, lights, AC and other components will remain powered while you are towing. On a long trip, that can drain your battery, especially if you make an overnight stop. The only dead giveaway that you are in ACC mode is that the green light on the start button will be flashing, but its not particularly bright or eye catching so it’s easy to overlook.
To give myself a bit of peace of mind and try to mitigate the risk I used both the RVI and I had the shop that installed my lighting harness run a charge wire to the battery.
I can’t be certain but I think one of the two already saved me once when I got in, saw a low battery light and felt my heart sink. Fortunately it started right up and shifted into gear. I just couldn’t recall whether i’d pressed the start button or not and the light I saw might have just been all of the lights going through their startup test.
I did not realize the RVI doesn’t support AGM batteries. Next time we hook up, I’ll pop the hood and see if it’s sending power. If that’s the case, thank goodness for the charge wire I had the shop install as a backup.
You could certainly be right about there being a bigger design problem at play here which Ford is not owning up to. Just haven’t seen any smoking guns anywhere. After the killing they made at customer expense due to the Bosch CP4 on powerstroke diesels, I’d not put it past them.