BAC Forum

General Boards => General Discussion => Topic started by: Mike DeFrees on December 02, 2025, 02:51:51 PM

Title: 2009 Beaver Marquis amethyst, cat C 15 engine, 45 feet
Post by: Mike DeFrees on December 02, 2025, 02:51:51 PM

I’m having trouble with my front parking lights, stopped working and I cannot find the fuse. All of my marker lights and tail light are working when the parking lights are turned on. But my front parking lights are not working. Can anyone help me in finding the fuse location or Relay to check?

Title: Re: 2009 Beaver Marquis amethyst, cat C 15 engine, 45 feet
Post by: Carl Boger on December 02, 2025, 11:38:51 PM

The fuse is likely a resetable breaker in the front electrical bay, but I doubt that it is your problem since the other lights are working.  I would start by tracing the wires back from the lights to see if there are any broken wires, or maybe first to verify that the bulbs are not burned out.  You likely have a bad wire connection, bad ground, or broken wire.

Title: Re: 2009 Beaver Marquis amethyst, cat C 15 engine, 45 feet
Post by: Steve Huber on December 04, 2025, 08:19:00 PM

Mike
Carl's advice is right on. Looking at the 08 Contessa wiring diagram (probably close to the 09 Marquis) it shows the following lights on the parking light circuit and fed by a single daisy chained source:
•   Top left light cluster
•   License plate
•   Bottom left light cluster
•   Clearance lights
•   Top right light cluster
•   Bottom  right light cluster
Whats not clear is why both front lights would be out as the diagram shows each are fed by a separate wire in the daisy chain. So as Carl suggested, start at the bulbs and trace back looking for a bad/broken connection. Also check the bulbs and sockets. Coach Assist has an 09 Marquis wiring diagram but I can't access it as I'm limited to what I've saved on my PC. Let us know what you find.
Steve

Title: Re: 2009 Beaver Marquis amethyst, cat C 15 engine, 45 feet
Post by: Mike DeFrees on December 16, 2025, 02:45:18 PM

Thank you so much for all your help. All the light bulbs are in good working condition just can’t figure out how to get the parking lights working On the front of the coach next to the headlights  but as you explained, it sounds like they are daisychained with the other parking lights so therefore it could only be a wire but it’s very strange both that would be out the same time 

Title: Re: 2009 Beaver Marquis amethyst, cat C 15 engine, 45 feet
Post by: David Ciotti on December 16, 2025, 03:33:57 PM

One wire that would take out both lights is the ground wire.

Title: Re: 2009 Beaver Marquis amethyst, cat C 15 engine, 45 feet
Post by: Frank Bergamo on December 16, 2025, 03:49:05 PM

You have the Kongsberg Chassis Control Module on your Marquis. I would recommend reading up on this system to better understand how it works. The best info can be found on the Monacoers web site, with a gentleman named Frank McElroy, who is the only guy in the country that has figured out this system. I would be careful who I let work on this system, as you could do more damage than you are fixing. Hope this helps, good luck!