Hi John and

. We are glad to have you join us. I am sure you will enjoy the website and forums. Good luck, stay safe and keep us posted.
I sounds like you may be having trouble with the internal transfer switch and the unit is not passing current through the inverter. One way to find out is to measure the battery bank voltage with a load on it before and during the inverter light being on and off. Also check the voltage of the power out of the inverter. Let us know what you find when the light is off and when it is on.
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Mike, Certified Master RV Technician
Amy, RV Merchandiser; Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser w/ Banks & 2 toads