Put boat away 2 weeks ago everything fine..
today turn port key fuel pump ran non of the gauges come up not ever the battery voltage? will not turn over it doesn't try? Also I had a chartplotter wired to that side hot all the time that don't work( that is off the merc wiring harness acc at the helm}
Went back checked the battery which is new it has a full charge
pushed the 50amp reset no change
It is like I got on power coming to the helm
I checked for power on both sides of the of the 50amp breaker and I have power
I assume if I have power on both sides of the 50 amp the 90 amp fuse on the starter is good
HELP Im out of ideas??

I'd double and triple check the grounds and hot leads at the batt, starter, and ground studs on the engine. Were you checking 12v with a test light or a multimeter?

fuse at the starter most likely .. on the starter lug little square fuse with a stud in the middle verry common to go bad
why on earth they put it there ill never know ..just as bad as putting the electric fuel pumps behind the motor mount

I would not have power at the 50 amp braker if that is bad right? I cant even see the ^^^^^^ starter

That still doesn't solve no gauges . I checked with millimeter it like on a car when you forget to hook up acc wire

all the power for gauges comes from there ..simple to test ..battery on with test light ck for power on that stud in the center .there is usually more than 1 wire on it .ive replaced many of them ..and there will be no power to the 50 amp breaker as you stated

1) Flip all the breakers under the back seat off, and back on.
2) Check under the dash by going into the head and look into the SmartCraft electronics. There are two fuse holders you will find among all that wiring loom; one for each engine. Check those fuses.
3) There are a couple of relays on top of the motor. Could be one of those as well.

I have power at the breaker

both fuses
good

still ck the square fuse at starter