Just an FYI in case you find yourself where I was: I could not find anything online to help me locate the Main Fuse for the Factory-Installed Webasto in my 2022 54" Low-Roof Western Star 4900EX. That's because it looks nothing like any of the online descriptions, and wasn't in any of the commonly described locations. It looks more like a Relay than a Fuse; I found it hanging from a screw attached to the sheet metal wall surrounding the Main HVAC unit; and it was along wiring that deviated from the main wiring harness. It was most easily accessed by lifting the bed. I was able to unplug and plug it back in to achieve a Fault Memory Reset in the same manner other people use the more common Yellow In-Line Fuses that are talked about everywhere else. Hope this saves someone a headache!![]()
Webasto Maine Fuse in a 4900 Western Star
Discussion in 'Trucks [ Eighteen Wheelers ]' started by SaintJohnValley, Jul 21, 2026.