[Rich Biebel]

No there is no adjustments on the battery charging output
Not even sure you have that as on those machines I believe it was optional
Most MH's have battery charging converters/chargers so a battery charging output is not needed
Anytime I have someone with this issue I advise them to hook up an external charger. Far easier and cheaper

Access to any machine for repairs is often a big problem and I always evaluate the job before doing the job.
Removal is sometimes the only way to do a repair.
Some installs were done as if there would never be any need to work on the machine.....a big mistake......

I change those temp sensors anytime I'm inside a 7.5 Onan.
I've seen them with a lot of deposits in the pocket below the sensor.
I think it was from Dex-Cool type antifreeze.....Don't use it !
I use green A/F......