Where is the Elec heater element located on an Atwood G6A-9

Yes
http://waterheatertimer.org/Atwood-water-heater-resources.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link:
http://waterheatertimer.org/Atwood-water-heater-resources.html

gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link for possible resources:
http://waterheatertimer.org/Atwood-water-heater-resources.html

Call service center.
Replace heater.

Gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

I don't know how you can drill into aluminum tank and install element.
That seems a good way to ruin the heater.
Why not just buy small 'under counter' 1500 watt electric water heater at local box store and install in-line before the water reaches atwood gas heater.
http://waterheatertimer.org/How-to-install-under-counter-water-heater.html
Otherwise I do not have a solution.
Don't blow yourself up by messing with gas appliance.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

See item # 9 ( 93844 ) at this link. Most RV places should stock the valve.
http://www.atwoodmobile.com/manuals/waterheaters/MPD%2093050%20PS%204.9.09.pdf

Why not the same model/size? Atwood 6 gal, works on propane with electronic ignition. Or, you can get the 6 gallon with electronic ignition, and electric element as well provided you are willing to run hydro to water heater as well, if not already there. Check any RV parts site for prices and availability. Some places are out of stock currently. I assume your current tank is leaking?

Open following link for Atwood water heater resources including parts list for different models:
http://waterheatertimer.org/Atwood-water-heater-resources.html

Following link shows ATWOOD Solenoid Gas Valve Type B - 93870
http://www.rvpartsoutlet.com/product_info.php?products_id=6268

If this model has a thremo couple you might want to check it. It sounds like that is the problem.

If it has the little thermal cut-off in power wire to thermostat (has a little plastic jacket over it) try removing it, and connect female spade from power wire, directly to male spade on thermostat, and see what happens. Also, make sure electrode is positioned in flame good for flame sensing properly.