I have a 2022 F350 withe 6.7 on order. I ordered the instant cab heat and that options comes with the 397 amp alternator.

Does anyone know the output at idel?

The reason I am looking for this number is I am installing a Renogy 60A DC-DC charger in my 5th wheel to recharge the batterys quickly while driving. It ties into the truck battery to get power. It will be fused and have a relay to connect the power through a solenoid and up fitter switch. So when the truck is off, it is off.

It will pull close to 90 amps when in operation.
I want to make sure I don't over power the alternator when in stop and go traffic when the 6.7 will be idling,. I know I will be find driving down the road.

Thanks

 

As you know idle output is affected by pulley size..
That said, did you have a chance to check with the alternator manufacturer?