I have the TM from here but I don't have a clue what years it's for. My 002A is a 1984 built by Onan according to the plate. Is there an advantage to using a 24v battery vs 2 12v batts? This is eventually going to become the backup power during floods at my cabin on the river and I could see it being a challenge to locate another 24v when the primary eventually fails, but 12vs are easy to come by even in rural areas. The battery boxes in it look like they will fit 2 12vs but I haven't checked because I have much to go through before I get there.
At least the delivery valve components that I got from Ray fit and installed easily so that problem's corrected.
The advantage is in the ratings and the availability.
Do yourself a favor and install a battery disconnect switch as well.