Thread: Fuse blocks and interference

It'll be within a foot of the battery and I'll run 8 guage from the battery to the block.

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Remember the fuse protects the wiring, not the device.
IF you run a separate circuit for each device, the fuse can technically protect the device and the wiring.
I run the same setup as you. 2 TM batteries, and a single battery for the boat lights, pumps, electronics, and starting the motor. All 3 batteries are Group 31 Marine Deep Cycle. I also use a single 3 bank 5amp each battery charger. You can get interference from the TM to the sonar units via the 3 bank charger. Unless you install isolators. Minnkota includes isolators with the charger.

I rewired my boat and added a 12 circuit fuse panel. I run wiring to feed 60 amps to the fuse panel. your wire gauge will be determined by the length of the run. The run includes to the fuse panel and back to the battery. If its 15' or wire from the battery to the fuse panel, then the run is 30'. I put all my sonar units on their own fuse. 1 fuse for the master boat switch. Fuse for 12volt accessory outlet for chargin my remote, cell phone, and baitwell pump.
I used the original 4 circuit fuse panel as a 2nd fuse panel for accessories controlled off the master switch. The master switch turns on/off the 4 circuit panel. That panel powers my Ethernet port, Heading Sensor, Mega 360, and Mega Live. All 4 need to be switched off.
I bought a spool of marine wire for all my circuits.
I have no issue with interference, or draining the batteries during 8 hours of tournament Crappie fishing. Nor lake swimming with the stereo running all day. Motor fires up and gets me back to the ramp every time. Plug it in at the camp ground and all three batteries are ready to go in the am.
Picture of both fuse panels.