My boat blew this Eaton 50A battery fuse and did not charge the battery. Had to call sea tow $ 900. I want to upgrade the fuse system to make it idiot proof. I could not tell the fuse was blown but got a low battery indication then an hour later both motors died. I was 40 miles away from land. This is what i found when i got home. The top fuse was the 5 A motor clean power and bottom was the battery fuse. Not sure if that came form the isolator or switch. I blew 4 of the 50 amps trying to get the motors started and messing with the settings. I think they are undersized because the 300 V8 Verados provide much more than 50 A
Any help would be greatly appreciated
It seems you have been running that boat for a while now without blowing any fuses so I don’t think the problem has anything to do with the size of the fuses. Something else is amiss. Have you recently installed any major electronics? Try disconnecting some of your electronic devices and see if the fuses don’t blow. Another thing to consider is if you have installed several electronic components that all draw say 15-20 amps onto one single circuit to the battery that could explain why you are blowing the 50 amp fuse. If that is the case you need to add another circuit directly to the battery to divide the load. The smaller 15-20 amp fuses for electronic components will probably not blow since the current being drawn by a single component might not be the problem.
I think it might be time for you to take it to a professional to check out the output from the rectifiers and voltage regulators if the problem is NOT too many electronic components on the one 50 amp circuit.
I would also have a second battery installed and get a contract with Boat US Towing After you determine the problem.
The Merc wiring diagram calls for a 150 amp fuse but thats crazy.
“Everyone behaves badly--given the chance.”
― Ernest Hemingway
Found the Merc Alternator output for my motor. The 300 V-8 Verado puts out 115 Amps but the battery will probably see about 80 Amps at WOT. That explains how i blew the 50 Amp fuses. This was the first trip that i opened it up all the way WOT. Hence the overload and blown fuses.
I purchased a clamp on amp meter online. I will follow up with actual numbers at idle,cruise & WOT
Rudy, If you don’t blow a lot more than a fuse soon. I am going to have to stop reading your posts.
For they always bring me tears
I can't forgive the way they rob me
Of my childhood souvenirs"... John Prine
Yeah not happy about blowing my family vacation and being stranded 40 miles away. I asked the boat manufacturer to reimburse me for the towing expenses. That's the very least they can do.
Agree with 4Ward. You have been too nice to the builder
I could not believe how many Amps the new V-8 Verado puts out. This pic is at idle 29.9 Amps. As i extrapolated the amp readings at 1200 rpm's it is very clear that the motors are easily putting out over 100 amps at (WOT) Boat is on a trailer so i did not want to rev it to get a reading.
Yes i do have tow insurance but do not wish to place a claim. It's very hard to bind a high value boat in Miami Dade County. When you do get a policy the cost is sky high. I don't want to risk losing coverage or an increase in cost. I'm asking the builder to pay for the tow and we are currently negotiating
-- Tug McGraw on getting a raise
Get Down Fishing Charters - Port Canaveral, Florida