Voltage fluctuating to the high side. Help

[Coalminer61]

My voltage stated bouncing from the green to red on the volt meter last night on the way to work. Lights and dash definitely getting brighter and then back to normal. Check with multimeter and voltage at batteries is jumping from 28.5 to 34.5 back and forth. Any ideas? Both alternators are new within the last couple years.

 

[Jeepadict]

That screams intermittant faulty voltage regulator, IMO. Double check all your connections for tightness before you start troubleshooting!

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[Coalminer61]

Started messing with it today and found a loose connection on the battery to battery cable. Repaired it and problem seems to be gone

 

[Mullaney]

Started messing with it today and found a loose connection on the battery to battery cable. Repaired it and problem seems to be gone

.
Yes! Glad to hear it seems to be resolved!!
Especially since it was a loose connection...