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Fuse for '93 25HP J25RETS

25Johnny

25Johnny

Contributing Member
Gents, have electric start (30-amp no-load), fish finder, and a bilge pump nothing else. I'm installing a battery mounted fuse. Is a 40 or 50 amp fuse correct?
 
???You are fusing the starter? A short circuit would damage any wires in the proposed 50 Amp circuit if less than 10 ga. Surely you don't have 10 ga leading to the fishfinder & bilge pump, do you?
 
Battery is in the front of the boat. I have about 13' of #4 cable going to the battery. Thought it would be a good idea to fuse the main line. Bilge pump and fish finder are individually fused.
 
25Johnny said:
Battery is in the front of the boat. I have about 13' of #4 cable going to the battery. Thought it would be a good idea to fuse the main line. Bilge pump and fish finder are individually fused.
Click to expand...

Very sensible

125 amps would be best choice i think for AWG 4, located as close to the battery as possible.

100 amps should enough but I would not go smaller. 150 amps would be the absolute maximum for 4 awg
 
25Johnny said:
Battery is in the front of the boat. I have about 13' of #4 cable going to the battery. Thought it would be a good idea to fuse the main line. Bilge pump and fish finder are individually fused.
Click to expand...

OK, that makes sense now that we know what you are fusing.
 
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