Battery Voltage

You should check the output at the rectifier.

Probably time for a new battery too.  11.7v implies a state of charge of only 10%, according to the Odyssey owners' manual (page 6): 

https://www.odysseybattery.com/wp-content/uploads/2020/05/US-ODY-OM.pdf

Question. If my battery voltage is les than 12.0 volt will that prohibit my voltage regulator from tranfering voltage to the battery from the altenator. Question 2. Can I check the AC voltage by disconecting the 2 yellow wires from the altenator and useing my volt meter.? 3. How do I determine if my Voltage regulator is working.? My EIS states that I have low voltage , I have not seen the voltage at >13v , when master switch is in the ALT position.Question 4. Should I see the higher voltage on the EIS screen when in the ALT position. I will apreciate any insight on these problems.

1: No;  2: Yes;  3: see link;  4: not sure

You might find this link helpful:

https://pointsforpilots.blogspot.com/2012/12/testing-rotax-912914-generator-and.html

i found the problem. I put one of the yellow wires from altenator on the wrong spade on the Voltage regulator. every one who helped ,THANK YOU VERY MUCH