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The tachometer is the commercial Tack that keeps track of driver hours. There may be a clock involved but I doubt it has any significant draw.

The truck circuits are truck only. No webasto, radio,fridge electric clock🤣🤣🤣🤣🤣 The only draws on the truck batteries should be lights, heater fans, air con, starter, wipers, sensors(4X4 locks)

It's a good thing you have a 2000km range!

The only Camper connection to the truck electrical system is the connection to the B2B. Solar,generator, house loads etc. all go through the house batteries. Even the 12v power supplies and the radio in the cab are supplies from the house batteries (probably the spot lights too)

the small red cable goes through the fuse holder top of picture then on to the Sterling B to B charger Those look like small batteries!

https://www.ebay.ca/itm/150612942001 Pretty sure that is the cap, 80 mm sounds right

You're quick, I did not get my picture finished!

I think top is truck bottom is house, could be the other way around!

There is a main battery shut off switch I never used but might be of use to save the batteries until you track this gremlin down. When you face the battery box it is top right behind a stainless vanity cover. You have to turn it with a "key" probably hanging right there, basically any flat piece...

Keep the heater outside the heated envelope, run the coolant lines through the foam.

Check your mounts.

The engine crud in the coolant circuit argument is just a non starter. If you have that much crud you need to flush and replace your coolant! I do maybe see the point about the air in the high rad, but in 10 years in the vehicle it was a non issue. Safety factor, it is oxygen barrier pex rated...

I did not bleed it regularly. The top 3 bars always ended up with air and I left it that way. That bathroom is so small it heats in not time.

The Webasto should not be running continuously. At -2C to -10C I would expect well less than half the time. The truck is quiet enough at night that you hear the Webasto fire up, I would know it was cold when I heard it. The loops do not need to be separated with a heat exchanger. I have not...

I would go to a bigger unit before two units. My understanding is most of the issues with coolant heaters comes from being oversized and not working enough. We had no issues with comfort at -20C for weeks at a time, We did live in it Feb to Aug here. You must maintain the heat, it is very slow...

Out truck had the commercial speedo with the tachograpgh. when you flipped up the tachograph there was a taped seal, behind the seal was the adjustment screw. I think it was a small slot.

Have you tried changing the fuel line between the filter and the Webasto?

It is supplied by its own line directly from the tank.

I find it a little scary seeing people with no clue about air brakes or any understanding of how drums overheat and fail to stop you if you ride them on a descent, jumping into one of these trucks and driving off. They are easy to drive, but if you don't know what you're doing it can end up very...

Our truck came with singles from the factory, It is the only one I have ever seen with that option. I would get everything you can dealt with in Germany before you ship it.