No.
Some SWAGs: Trolling motor is probably 24 volt and it may have a 12v option so you may have 3 wires going from your 2 TM batteries to your TM and it may have a 50 amp circuit breaker somewhere...probably at the batteries. That usually is a separately wired item.
Everything else runs off the main start battery. There are basically 2 circuits which are power to the dashboard-helm station switchs/ panel instrument feed which is continuously available, and switched, fused (20 A fuse inside engine near starter solenoid power distribution point) power from the Ignition Switch...purple or purple stripe wire on Mercury controls. The purple pigtail is switched power feed and is at the helm for distribution to switches and instruments requiring to be off when the engine is off and there may be another at the 8 pin remote electrical cable connector within the engine .
Boats usually have a fuse panel (My '89 Ranger 680 did) and if everything is out then I'd inspect the main feed....not sure whether Ranger has both feeds to this box or just the always available feed. Corrosion could prevent individually fused circuits from functioning at the fuse plug within the panel.
Onboard charging probably visits all 3 or possibly just your TM batteries. That is a separate circuit and fuses are inline.
