Strange fuses

[FSH 210 Sport]

It’s not impedance... its just resistance. Impedance is resistance in an AC circuit or XL, resistance is just that in a DC circuit or OHM’s. There is no inductive or capacitive reactance in a DC circuit.

 

[drewkaree]

So are these resistors meant to blow if I did something stupid when charging my batteries? (I debated if I should start another post but decided to jump on this one) My stupid story: Over the last month batteries went dead in my boat while on the lift. Just bought batteries 10/2020. I bought Duralast Jump Starter and hooked up battery to try to get the boat to turn over. At one put during my attempts I switched the POS and NEG with the Jump Starter and battery. The boat horn beeped and (being stupid) I tried cranking the engine anyways. At that point I pulled both batteries and brought they to AutoZone where they charged them fully. Put the batteries back into boat and I get NOTHING when I turn the keys. I am hoping at this point these resistors saved me from stupidity? I see that the green 20amp fuses where blown. I switched the 20's but still nothing. My thought is maybe the black ones are blown but I am having trouble finding them. Based on what I did, is this fuse/resistor box the first place to start when trouble shooting or should I be looking elsewhere? Any insight would be appreciated.

This isn't an answer as to what may have happened, only what I would do after sorting it all out. Ditch that jump starter, pronto. There are too many out there that protect you when mistakenly reversing the connectors, if yours doesn't have that, you're asking for issues. That's also a pretty dang huge jump starter, given what's available. They make units a quarter of the size, with the reverse polarity protection, and they can easily be stowed away for those times you might need it.

https://www.amazon.com/NOCO-GB40-UltraSafe-Lithium-Starter/dp/B015TKUPIC

NOCO for $75. Smaller than a loaf of bread.

 

[212s]

NOCO for $75. Smaller than a loaf of bread.

I have one of these for emergencies. Mine will start a V6 with ease in the cold winter (started the neighbour's car). It'll power or recharge other devices with the USB port, and the LED lights are bright enough for working in the dark at the side of the road. Never had to use it for our vehicle and the boat has dual batteries, but for the price it's a handy item to keep around, and with 500+ charge cycles and slow self discharge rate it will probably get passed down to the kids.

 

[PortTobacco II]

This isn't an answer as to what may have happened, only what I would do after sorting it all out. Ditch that jump starter, pronto. There are too many out there that protect you when mistakenly reversing the connectors, if yours doesn't have that, you're asking for issues. That's also a pretty dang huge jump starter, given what's available. They make units a quarter of the size, with the reverse polarity protection, and they can easily be stowed away for those times you might need it.

https://www.amazon.com/NOCO-GB40-UltraSafe-Lithium-Starter/dp/B015TKUPIC

NOCO for $75. Smaller than a loaf of bread.

Agreed. I returned it.

 

[PortTobacco II]

In my boat, there are fuses by the battery...that is where I would start, fuses on the ECU in the engine compartment, and fuses in the starboard side under the seat. This is something would be good for someone to make a quick video of....

Thanks Julian- The "ECU" (engine control units) with the two fuse boxes on back wall of the engine compartment. I am hoping I don't have to get to them because they look to be difficult (at least for my fat ass) to get to. Hopefully, I can locate these inline fuses.
I will attempt to make a video.

 

[PortTobacco II]

I found my multimeter and tested the fuses and resistors in the plastic box by the battery.
@drewkaree bought a NOCO Genius5..... hope this is adequate. Also ordered a service manual.

@Julian looked under the seat on the starboard side. Could not locate anything that looked like an inline fuse. I did find this Actia SPU-25-15-1 and googled it. Thought maybe that little round thing might be a fuse so I popped it off and it did NOT seem to be a fuse...so I popped it back in place.

I tried to pop the fuse box covers off the fuse boxes by the ECU's but could not figure it out. Did not want to force anything back there. Plan to search to figure out the technique to remove those fuse box covers. Then test those fuses. But I am doubting what I did messed up the fuses back by the ECU. Seems like the two 20A fuses that blew and I replaced in the box by the battery should have saved me. PLUS....I am going to recheck my batteries to make sure they are not faulty. Thought I ruled out the batteries BUT you never know.

 

[Julian]

Seems like the two 20A fuses that blew and I replaced in the box by the battery should have saved me.

So are you back in action or still have something not working? That small fuse box by the batteries should be the main ones for the boat. The ones in the ECU on the back of the engine compartment will be engine function focused.

 

[PortTobacco II]

@Julian still does not crank at all. I have gone thru the basics checklist in my head (because sometimes its the simple things) lanyard, in neural, cover for clean-outs plugs is secure. I am starting to think the batteries are at fault. (But they are new 10/2020 and I just had them check by AutoZone)

 

[Beachbummer]

If it works the same as the SX230, The ECU gets power from the live leg of the thick red wire going to the starter relay. and that is fused within the ECU. You want to be able to pull the fuses there to confirm.

 

[Julian]

Not sure if your ECU looks like this, but you'll want to check the fuses in the ECU next:

 

[PortTobacco II]

@Julian Yes it does look like that.
I did try to remove the square fuse box covers but could not figure that out. I thought I could just squeeze it and would come off but my Kung-Fu grip was not up to the task. Anyone have any tips on how to remove these square fuse box covers? Maybe press one side and pry with a flat head screw driver at the same time on the same side?

 

[PortTobacco II]

@Julian Success!! Thanks Julian. Got both engines turned over.
Opened up the square fuse boxes on the rear wall of engine compartment of my 2016 SX240. Found that the 30A fuse in each box was blown. Inside each fuse box there was a white fuse pulling tool and spare fuses. The inside of fuse box cover has a helpful diagram of the fuses and notes the spares. Attached are a few pictures.

 

[Julian]

@Julian Success!! Thanks Julian. Got both engines turned over.
Opened up the square fuse boxes on the rear wall of engine compartment of my 2016 SX240. Found that the 30A fuse in each box was blown. Inside each fuse box there was a white fuse pulling tool and spare fuses. The inside of fuse box cover has a helpful diagram of the fuses and notes the spares. Attached are a few pictures.

So what was the trick to getting the cover off? Looks like perhaps a couple of tabs on the sides (from your photos)....

Glad you got it figured out!

 

[PortTobacco II]

So what was the trick to getting the cover off? Looks like perhaps a couple of tabs on the sides (from your photos)....

Yes just had to squeeze the tabs real good. Ended up getting one side of the cover to come free then eased the cover completely off with care.
Oh...on the port side the fume exhaust duct (the black dryer vent looking thing) was in the way of the fuse box so I cut one of the zip ties that was holding it place. I will reattach that somehow.

 

[giroux68]

Where were those resistors located? Im thinking that might be the problem with my water temp reading and NMEA error. But I don't want to thread hijack.

 

[Muegerl2023]

So are these resistors meant to blow if I did something stupid when charging my batteries? (I debated if I should start another post but decided to jump on this one) My stupid story: Over the last month batteries went dead in my boat while on the lift. Just bought batteries 10/2020. I bought Duralast Jump Starter and hooked up battery to try to get the boat to turn over. At one put during my attempts I switched the POS and NEG with the Jump Starter and battery. The boat horn beeped and (being stupid) I tried cranking the engine anyways. At that point I pulled both batteries and brought they to AutoZone where they charged them fully. Put the batteries back into boat and I get NOTHING when I turn the keys. I am hoping at this point these resistors saved me from stupidity? I see that the green 20amp fuses where blown. I switched the 20's but still nothing. My thought is maybe the black ones are blown but I am having trouble finding them. Based on what I did, is this fuse/resistor box the first place to start when trouble shooting or should I be looking elsewhere? Any insight would be appreciated.

@PortTobacco II we had the exact same thing happen. What did you have to do to resolve this issue?