Bunk heater keeps dash lights on???

if it drains your batteries you need new ones.... you can run the bunk heater all night with your parking lights on and it's start just fine...

 

I have same issue, dash board lights on and front cab heater fan on. How to save batteries? After 8-10 hours Webasto drained brand new battery to 10.9v-11.8v.
In my previous Cascadia I disconnected one extra cable from the ignition key to keep the APU and Webasto running with the engine running.

 

What model, year is the truck?

 

I don't think this is a defect, the dash lights do come on when the door is opened. With the front blower on the body controller is functioning which will wake up the light control module. The dash lights are all small micro LEDs and do not draw much current, so they should not cause battery draining. You can turn down the dimmer dial on the light control panel where your headlight switch is to minimize the light if you like.

 

If it really bothers you you can remove the feedback wire at the body controller from the bunk heater. I don’t recall what terminal it is though.

 

Heavyd, I have a 2023 lt and the front lower doesn't turn on when the sleeper no idle heat is on. Has the factory battery apu. My 2020 did and it did a great job in the winter keeping the snow and ice clear from the windshield. At the dealer now and they are back and forth with engineers since they are clueless as to why there is no power going to front blower moter with sleeper heat powered up. The manual states this option is supposed to work. And help I can pass to the dealer?

 

I haven't seen this behavior with 23's yet. This will be a learning opportunity for us both.