What’s This

[mcomeaux]

Trying to figure out what this item is called. It’s located in kitchen slide for microwave electical. Microwave quit I suspect this is problem . Breaker seems to be working. 2019 Keystone Alpine FK .
The yellow item is in question.

[dutchmensport]

Looking up the name. But the yellow one is a dedicated line running off the inverter so you can power 120 AC from your battery when not on shore power. The brains of your trailer know when to switch the power between the inverter and the shore power. That's the yellow one.

The clear one is for regular AC 120 when plugged into shore power.

I'm still looking for the name of this item. No idea what it's called. (yet).

[ChuckS]

Both are Quick Splices used in many RVs.. My Alpine has several.. They are also a potential for electrical issues down the road if you overload the wall outlets a lot..

And of course ( both shown in your image are 120 volt AC splices )

Such as running floor space heaters.. Which I would not do with the existing SCD wall outlets..

[ChuckS]

Also the color of the ROMEX tells you what you need to know about the circuit the splice powers..

Some are 15 amp circuits and some are 20 amp circuits

You will also find those quick splices up under the belly coroplast ( at least 4 to 6 of them )

EDITED ... The correct name of the splice is MOLEX.. and the color is to identify the amperage of the circuit its being used to splice together.
You will find several yellow and clear Molex splices... they ALL CARRY 120 volt shore power

[JRTJH]

Yep, They are MOLEX quick splice connectors.

They are common in almost all double wide manufactured homes, used to connect "home side A to home side B" and usually located very close to the circuit breaker box. They are used, in those homes to connect "ROMEX TO ROMEX"...

Keystone uses them in nearly all slides with "120VAC outlets in the slide"...
They typically are in the bottom of a "hidden compartment in the main coach" near the end of the slide. As in your application, white is for 15 amp MOLEX plugs and white is for 20 amp plugs. You can "use a bigger rated plug for a smaller rated circuit, but not the other way around.

Keystone's use almost always is to connect and transition the ROMEX main chassis wiring to the flexible wiring (think multistrand extension cord) required by the movement of the slide. It usually is routed out the bottom of the main coach, into the belly, then strapped to a "flexible cable guide" that keeps it from drooping under the slide as it moves in and out.