Hey, I wanted to see if I could fix this problem with the help from people who know a bit about this stuff.
Boat 07' Key West Bay Reef w/ Yammy F150. No prior electrical issues.
Issue: I had been driving at planning speed when I hit the motors trim button briefly and the motor stumbled and almost died. I tried it again and the motor stumbled again. Throughout the day I learned that my Battery Meter on the dash said that my batteries were around 13.4V's most of the day and the motor ran fine. Strangely the meter would say that my batteries were around the low 12V's and if I pushed the trim at this time, the motor would stumble or even die. The Meter would read both 13.4 and low 12's off and on throughout the day. At one point I stopped the motor to fish and it would not start. The meter showed the battery at 12V and would go down to 9V or so under the load of the starter. Because of the fact that the meter would show the battery go from the mid 13's to the low 12's while running, back and forth made me rule out bad batteries. I have in fact replaced the engines batteries and the problem still exists, so bad batteries can be ruled out. Just now checking the boat while I hit the motors tilt switch, it hardly moves. It goes so slow. Ok so where do I start. Seems like a bad connection somewhere. I have a voltmeter and I want to figure this out.
Other little facts about the set up. These batteries are only used on the motor and all (?) electronics. There's a separate set for the Trolling Motor.
There's a Perko Switch and a fuse (?) see pic.
Thanks for any help
Jared