My voltage running is 13.4, very briefly hit 13.5. Thanks for solving my problem.
It won't be solved until you see close to 14.4 volts when driving. Check regulator connections, particularly the earth, and if no improvement change reg. Its possible that one of the three phase output's is down due to blown rectifier which would explain your symptoms.
Showing 13.4 volts suggests some charge current, but a full volt down on what it should be with fully charged battery.
