Mystery Object

[Strange Steve]

While low-crawling on my shoulder blades yesterday, looking for (and FINDING) problems to fix on a 2020 Chateau 25V, I encountered this strange little object. When I reset the yellow lever, I heard a momentary little whirring sound.

As I have yet to read through the entire owner’s manual, I was wondering if anyone here knows what this thing is...and why we need it.

[Brad2018]

This video explains it quite well. They are also used in boats. I believe it is wired between the alternator and ignition. It's odd that yours was tripped. Have you had any strange electrical issues?

https://www.youtube.com/watch?v=dr7AA7rU3WY

[Strange Steve]

Hadn’t noticed anything electrically strange. And thanks for the link!

[TurnerFam]

that is a DC 'breaker', otherwise known as a high-amp resettable FUSE... generally inline between high amp devices that require a lot a 'sudden' power. I imagine yours could be the fuse link between the Solenoid and the Latching Relay for providing Chassis battery charging from Shore or Generator power, after the House batteries have reached a certain level, etc. The 'whirring' noise could simply be the solenoid 'powering up' when the power was reestablished.

You may not be seeing any 'strange' electrical behavior simply because your Chassis batteries didn't need any charging, so nothing seem 'amiss'...

that's just a guesstimate, since you won't know unless you trace these wires back to their termination points...

[Strange Steve]

...that don't tell what that "mystery object" is. Neither the Thor nor Ford owner manuals mention that breaker in the slightest. I guess I'll just have to low-crawl on my shoulders some more and trace the wires.

[EA37TS]

Have you contacted Thor and asked them for the electrical diagrams for your coach? While asking for the diagrams ask them what that specific breaker does.

[Strange Steve]

Yes, why don’t RV manufacturers supply as-builts like for other dwelling places?