Is the refrigerator a residential refrigerator (120 volt only).
My guess would be that the refrigerator, microwave, and outlets are 120 vac devices only. The outlets and microwave are probably not wired to run off the batteries through an inverter. The refrigerator might be run through an inverter. The fact that it is it running off the batteries could be because you do not have the inverter turned on or the batteries are so low they are below the inverter low battery cut off so it is not producing power for the refrigerator.
When you start the generator you are getting 120 volt power as the refrigerator and microwave work. My guess would be that the outlets are not working because the gfci outlet has tripped. If this outlet trips it can cut power to all downstream outlets. Look for this outlet either in the bathroom or kitchen. Now here is the interesting part. You must have 120 power to reset a gfci outlet. So find the outlet, start the generator, and press the reset button on the gfci outlet.
I’ve made many assumptions. Hope this helps.
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2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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