12 volt issue shutting of my overhead AC's

jurob wrote:
1997 Gulf Stream Scenic Cruiser.

When AC's are running, If I turn on a 12 volt light it shuts the it shuts them off. I'm pretty sure it's both and maybe it might be one ac on 1 occasion (just purchased).

AC's are on a time delay so they don't start up at the same time and after they are tripped they come on at 3 minutes and all is fine unless I turn on another light and it repeats the cycle. No issue if I turn on a 110 light or microwave, etc...

Happens on shore power and gen power.

Almost makes the noise as if you raise the thermostat and you can hear the click when it shuts off.

All ideas would be appreciated! Or is this normal? Old gentleman I bought it from kept mentioning that the AC's are on time delay and its 3 minutes like clockwork.

I'm voting for florescent lighting, as the culprit and evidently your brand of ac's doesn't like them. Our Dometic units don't mind them at all, however.
You might want to take apart one of the affected lights, disconnect the ballasts and hang a 12v incandescent bulb temporarily in it's place. If all OK, I'd consider converting them all to LED lighting, rather than try replacing the ballasts. You'll get some energy savings in the process, as well.