Want to replace my power center

The trailer is only a few months away from the dealer. When I picked it up, there was no 12v power at all. The service dude that was doing the walkthrough with me said that they forgot to plug it in to charge the battery. So he plugged it in and everything worked. I took it home and charged it for about a day and a half. Unplugged, and nothing worked. So I checked the fuses. The 40a fuse, which I was told was to protect against the battery being connected backwards was blown, and the #6 fuse I talked about above was out. I replaced them both and everything works fine, until it charges for a while. It gets between 50% and 75% charge and it blows that #6 fuse. Then, nothing 12v works unless we replace the fuse, or plug it in. We always camp with hook-ups, so it's not been a big deal. But we need to get it back to the dealer. We'll be done with our annual Siskiyou trip in two weeks, so I'll take it in then.

Thanks for the info that the 8735p is not going to be a problem. I was afraid of frying the battery.