Coach Power Battery Help Needed

[Robert08]

I’m new to motorhomes and definitely not real savvy on the electrical side. I have a 1999 Gulfstream Sun Voyager 8293 MXD. When starting the Motorhome I would push the chassis “Use” button on Intellitec Battery Disconnect panel to be able to turn the ignition to start it. I had noticed once it was running about a minute later my Coach light on the Battery Disconnect panel would also come on and I would also have Coach power inside the Motorhome (dome lights etc.). For some reason now when I start the Motorhome the Coach light is not coming on the Intellitec Battery Disconnect panel and I do not have any Coach power inside the motorhome. If I push the “Use/Store ” button for Coach on the Battery Disconnect it will not come on. What is interesting with the motorhome turned off if I plug up to shore power the Coach light on Intellitec Battery Disconnect panel is lit and I have Coach power inside. Any thoughts on what would prevent Coach power from working when the Motorhome engine is running?