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Join Date: Jan 2017
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You may be stepping into no-man's land there, it depends on how the alt charges. I work on Fords and the ECM or PCM or whatever, controls the alt charging by direct input into the alt, if you have one of that type control you can't just get a standalone alt as it will shoot codes all over the place. The Ford guys do have someone that makes special alts just for that thinking but $$$$$$$$$$$$$.
Obviously can't see it but I feel you have something electrically wrong with the van. Besides that, the 130 amp alts the Fords use do not charge as fast as you seem to need, they take 8 full hours to recharge a known good battery run fully down as certified by Ford itself in testing. Short story.............NO alt can charge that fast, it burns out the alts and what the Ford ones do like others. Modern high amp alts put out whopping amounts of power but it is only intended for a short period ONLY, pushing them past that fails them from overheating as NO WAY were they built to make that 130 all day long, only long enough to quickly fill battery back up then it gets a rest by trickling and normal for all alts on cars.
Pretty much all new alt paperwork says you void the warranty when you load one that hard, i.e., charging at 100% all the time, they simply will not last and the rebuilders tell you so. The number was intended to be the highest number and rarely used and not the normal output all the time, it's been that way since the '50s. You even void the warranty if you admit you tried to crank car up with new alt but dead battery, it can fail the alt in minutes, the paperwork clearly states the battery must be already fully charged when you first crank back up. That's for a reason, I cannot count the number of failed new alts people came back with for a refund doing that, and asking them they tell you and bam!, no warranty on part. We'll happily sell you another one though. Similar to how people butcher brand new fuel pumps in the same stupid ways.
Reason I say something wrong with van (or in the use of it) is that others do exactly what you do and all day long, there's something different there. Maybe go to the city and dig up whoever runs the wheelchair stuff for invalids and talk to some mechs...........or maybe even search the web for them.
One thing I know. If running the chair batteries enough to kill them then when parking vehicle I'd be charging from the house not the van. You're thinking you can power van up like a house and that simply won't work, the reservoir of power is simply too small.