Thor Forums

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AGSs don't run on anything (generator or otherwise).
All the AGS does is turn on the generator when the house batteries get below a set voltage.
This allows the generator to supply 120 VAC to the converter/charger (or inverter/charger if so equipped) to charge the house batteries if the USE/STORE (battery disconnect) latching relay is closed (USE).

But your actual problem appears to be AC power related (assuming your fridge is residential), with inconsistent symptoms. To compound the issue, the symptoms change depending whether you are on SP or using the generator. Realize your coach has two legs of 120 VAC (assuming you have a 50 amp coach) and both SP and your generator supply two legs of 120 VAC (SP is actually 240 VAC but that is not relevant to the issue) to the coaches' loads through an Automatic Transfer Switch (ATS).

So you need to determine if the hotplate and the fridge are on the same AC leg.
You need to determine if the ATS is working properly.
You need to have SP available to help you track down the symptoms.

Some RVs may also have an Automatic Energy Select Switch (AESS) that switches power between two different AC loads on the same breaker circuit; but that is normally limited to 30 amp RVs.