Gauges Fanning Left and Right on start up
Is it normal for all of the gauges to fan full right, then full left, then read normal? Additionally, I filled up with gas the yesterday and the gauge failed to move to full from a quarter tank. When I shut the car off and restarted it, the fuel gauge kind of ground to the full level. Since then, the gauge has responded normally with the exception of the fanning right and left.
A friend of mine has a full size Ford truck. His did the gauge fanning and shifted funny. He replaced the battery and everything went back to normal including shifting smoothly.
Additionally, the light sensor flashes the headlights on and off in the morning (dealer couldn't replicate the problem even with a cell phone video). I also had a new alternator put on and in the morning under full load (seat heater, rear defrost, radio, headlights, driving lights, fan blower) it drops the gauge from 15 volts to around 9 and the lights dim. When the rpms increase, the charge needle jumps to 15 volts. When the car warms up, it charges normally even under full load.
Are these symptoms of a battery issue? Original battery in an 04 GXP with 80k.