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Sucks that you HAVE to dump the black in order to dump the forward gray.

Well... that's a really stupid design...

Exactly. Mine is the same way. Three of the 4 tanks empty through one common outlet. The difference being that the individual tank valves are close to the tank outlets and do not obstruct the main trunk of the common drain. In theory I could empty all three tanks at the exact same time. I would...

Yeah, on my 377MB all three tanks can be dumped separately. I don't get what LCC means about a tank series.

Not sure if it's an option for you without knowing the pass-through space constraints in your 3780MB, but here's what I did in my 377MB. I cut the shower drain line close to the vent stack and capped the stack side. Then I rotated the shower p-trap and added a coupling and a length of pipe to...

Hi all. I installed new Solera slide toppers on our Milestone 3 months ago. The two smaller slides have been great, but the toppers on the 10ish foot kitchen slide and the 12 foot living room slide both collect a ton of water every time it rains. I used the factory recommended pitch and tension...

We JUST spotted our first Milestone in the wild. I was also surprised that we're kinda rare.

Figured out last night that it 100% was a faulty multimeter! Got a new one and the new battery is reading 12.9V. Likely the old one was as well and I wasted the money on a new battery. And you're absolutely right about the touchscreen. It was reading 13.5V with the battery disconnected while...

I'm still only getting 11v at the prewired Furrion connection point at the rear of the coach. I'm getting 13.5v from the running truck as measured at the junction box in the pinbox. I looked in the manuals section of the site and didn't come across a relevant wiring diagram. Am I basically...

I’m in the process of installing a rear camera now. I also have the white and green/white wires at the rear. Do you know which is positive and which is negative?

I've emailed the diagrams Heartland sent me to the mods, so hopefully they'll be posted here for everyone. I'm happy to email them to you if you want to DM an address. According to the wiring map, the black wire with a white stripe is the power supply for the LCD touch screen control panel. You...

I spoke with Heartland yesterday. This morning they emailed me both the electrical and plumbing diagrams for the 2019+ Milestone. The plumbing diagram confirmed that 1) my two forward tanks are mislabeled 2) the engineers intended to run the full bath toilet, the half bath sink, and the shower...

2021 Milestone 377MB. We had both our black tanks pumped out for the first time 7 days ago. We were in the camper for 3 days after that, then gone for 4 days. So after just 3 days of use, the black tank backed up into the shower last night. I pulled the wall between the basement storage and the...

I bought one a couple weeks ago and used it this morning when the honey dipper came out and emptied us. The valves are 100% mislabeled. Of the 4, two are correct and two are transposed. The forward black tank drained crystal clear, and the forward grey tank drained... not clear. Now I know why...

That's genius!

2021 Milestone 377MB, we picked her up at the dealership a month ago, first time RV owner. I have her parked on private, family-owned property. We've been dry camping for the last few days as a sort of trial to learn her and work out the kinks. She has two grey tanks and two black tanks. The...

We bought a 2021 Milestone 377MB a couple months ago. Let's breathe a little life into a 2 year old thread :D

Over the weekend I pulled out the aft wall (left) in the basement storage, cleaned up the plumbing, wiring, and ductwork, and gained 3 sqft of previously unused floor space. 3 square feet doesn't sound like a lot, but when you only started with 15 sqft, 3 more is a 20% increase. I'll take it...

What a great idea! Thanks!

Well done. I just bought a Milestone 377MB as a first time RV owner and found exactly the same mess behind my wall, even some screws and wire connectors as others have said. Planning on sprucing it up this weekend. Any tips on new wall placement before I get started? If you had to add new...