I ASSumed my 1991 C has an alternator that starts at about 14.6 and soon tapers to 13.8 like my 2003 truck has. Nope!
I was going to install a DC-DC charger to maintain the voltage at 14.6, but happened to put a voltmeter in the dash cig lighter socket for a two hour drive recently, and voltage stayed at 14.6ish the whole trip. Surprised me.
Since the alternator amps stay around 23 amps, (low amp 2G alternator) it would be a complete waste to install my 20 amp DC-DC now in the TC.
I suspect it would be the same for the OP with a higher amp alternator and his 40 amp DC-DC. Wasted effort!
Only excuse for the DC-DC would be for LFP house batts and that idea they might overload the alternator. Seems that idea is in dispute and I have no clue about that.
