Assuming I have Disconnects that will be off when not charging or on shore power, will it cause any problems to have the house [front] and Onan start batteries in parallel for charging?

Thinking that since the charging voltage is higher than the batteries and no load on them they will not draw from each other. They are two different types and capacity though.

Recently had a short in the heavy gauge cable to the rear battery. I had thought that it was hot only on the boost switch. Turns out it was paralleled to the front and there was a curcuit breaker. That heavy cable is also the only line to the house battery.

The short melted the neg terminal to the front battery. Lucky It didnt cause more problems...happened at 2AM while camping. Replaced the battery, fixed and insuated the cable, and had to replace the buzz box with an Intelecharger as it was only outputin 8.52 volts after the short. I also placed a disconect switch as a safety device. I will also be placing a cuircuit breaker to the house battery

Got Allen Hendersons 17" wiring diagrams [highy recomended BTW] and see the original configuration was with the house battery in the rear. I may return to this with 2 6V GC batteries in the future. THe coach had been used by the PO for ~10 years in the configuration I bought it in, and I ran it this way for over a year without a problem.

For now though, the rear battery is only connected to the boost solenoid. Problem is, the rear battery is not charging as the Onan alternator is either not working or has been disconnected so no tag line back to charge it while running. [Onan runs /works great otherwise]The large cable is hot when on shore power, but that is also not charging since the line from the circuit breaker is disconected.The battery would hold a charge for quite some time only being used for onan starting but will run down at some pont.

So, my question is, if I use the disconnects to sparate the batteries when not on shore power or being charged, is there any potential problem in paralleling them to charge the rear battery when it is? I would place another disconect switch in line with the circuit breaker in the rear.

My understanding was that the PD Intelechager acts somewhat like a combiner in charge mode.

I actually have a Yandina combiner but don't see where it could be placed in this configuation to solve the problem.
Only thing I can think of is using it in addition to the isolator as in the photo side writeup referenced on GMC info but it would only charge while running the engine

I do think the 2GC bank is the best solution long term but not in the buget right now. Hence my question. In the interim, and under the conditions I mentioned, is there a potential problem I am overlooking?
Mind you it was functional the way it was [paralelled] for many years and the batteries althogh 3 and 4 yrs old charge and load test fine. The short was a frealk accident that exposed a flaw.

Matt: I seem to recall that many coaches back in the day had the Onan alternator disconnected due to some sort of feedback problem to the board and was charged by either the converter or the engine alternator. Getting that to work might be an option, but not if is a potential issue with the board. The Onan [knock on wood] is doing great and I almost hate to mess with it. I was looking at adding an electronic ignition to it but havent for the same reason.

I removed the rear 6d battery from my76 glenbrook and installed 2 golf cart batteries up front with the starting battery to gain storage in the rear compartment . I also moved the 50 amp circuit breaker and bypass relay up front also. Actually with the 50 amp breaker up front it would protect you better with the short you had. You should get rid of the generator starting battery in the rear you don't need it. There is only a fraction of a volt drop in that big cable with the Onan cranking. You also should disable the Onan factory charge circuit if it is still connected you don't need it. I made this modification 20 years ago it it works real well for me.

can one of you provide a link to those charging schematics - Thanks in advance!