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voltage fluctuates

I had the Voltage fluctuate from 11.7 to 14.1 so I changed out batteries, and new alternator today I continued traveling and having similar problems  any thoughts still driving
Tony Pasquale
SOLD....
'99 U295 36'
WTFE, 04/99, #5572
Toad: 2020 Equinox

Re: voltage fluctuates

Reply #1 –
Tony, sent you a PM
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: voltage fluctuates

Reply #2 –
It would be good if the OP would post the solution.

Re: voltage fluctuates

Reply #3 –
Could be the battery isolator.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: voltage fluctuates

Reply #4 –
Quote from: red tractor –
Could be the battery isolator.
Hi Red, I was talking with Rudy and we were leaning that way. There was another issue with the New Amp-L-Start installed that kept flashing slowly indictating the Start Battery either not connected or improperly wired, which could indicate bad Isolater.  Per Rudy's suggestion I was going to contact Rodger to check on an isolator. Thank you for your reply and help. Tony
Tony Pasquale
SOLD....
'99 U295 36'
WTFE, 04/99, #5572
Toad: 2020 Equinox

Re: voltage fluctuates

Reply #5 –
Tony, sent a PM,  Roger
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN