Idle Voltage question

[iabass8]

175 faststrike
model #j175gleis
Cranking battery g31 AGM 800cca/1000mca 205(might be 200) reserve.

boat just came out of storage unit and back from marina with new water pump/tstats. Just bi-anual service. 

Following was done on muffs:

Motor off and battery charged, key turned to "on" voltage on humminbird fishfinder dash reads 13.0-13.1 and stays stable.

Crank motor, fires right up and voltage on same electronic goes slowly up to 14.0-14.2 and sits stable. Revved a little on muffs up to 1100 for a second and no change to voltage-stayed in the 14v range. Only did this twice as I'm aware what happens if I continue higher. 

Trimmed motor up and down a hair and dropped voltage .1-.2 volts but came back to 14.0-14.2 and remained stable. No change putting in forward/reverse.

Turn motor off and voltage slowly drops back down to the 13.0-13.1 and sits stable.

It's been 6 months since ive been out and I just dont remember if thats normal. All connections were cleaned pretty liberally and everything is fastened down with star washer and ss nut (no wing nut) really, really tight. I just don't remember if that's normal or not at idle. I remember when running down river it would charge up over 14. I don't recall the exact but I want to say 14.6? I used wingnuts last year on cranking battery (maybe connections weren't as good last year?) and just recently switched to the star/SS nut for piece of mind. Dont recall if voltage came down or not when I came off pad. I always turn steering wheel electronics off when i turn big motor off. Am i okay here?

I will check the readings tomorrow /w a multimeter vs the unit but I just want to make sure I don't have anything to be concerned about. Just a bit OCD about these things. 

[Kevin22]

Sounds fine. Your bird is reading voltage off your alternator. My merc outputs 13.7V so 14.0-14.2 sounds like you have a great alternator! 13V is a fully charged 12V battery. Everything is correct. Good choice going to nuts instead of wingnuts, much better connections! 

[WIGuide]

You're good to go. You know your alternator is charging and giving the battery juice when the motor is running. When it's not running you're voltage isn't going to stay higher because nothing is giving the system more power than the 12v battery. Back off on the OCD and go fish. If you're still super worried about it don't make any 30 mile runs on the first trip out.