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Old 02-14-2011, 03:58 PM   #1 (permalink)
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Default Wiring Alternator directly to battery?

Okay, I got a CRX and I relocated the fuse box to the rear storage area. I have a wire from the positive battery terminal to the fuse box, then another that comes from the fuse box back to the alternator. It's been working fine for over a year, but recently had problems with the wire having too much resistance.
Correct me if I'm wrong, but can I just run a wire from the alternator to the battery (with an in-line fuse)instead of running it all the way back to the fuse box (like 10 feet away). I have an extra port on the battery terminal, so it's not a big deal. On my dad's old mustang and '37 chevy it goes from the alternator straight to the battery, so it makes sense it would work. Ideas? Experience?

Also, if the alternator puts out 65amps, how does the 60amp fuse hold up? If I do put an inline fuse between alternator and battery should it be 70amp or 80amp?

Last edited by ZCHONDACRX91; 02-14-2011 at 04:35 PM.
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Old 02-14-2011, 06:07 PM   #2 (permalink)
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Anything is possible why relocate the fuse box to the back just tuck it under the dashboard.
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Old 02-14-2011, 07:23 PM   #3 (permalink)
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Originally Posted by l337h4l View Post
Anything is possible why relocate the fuse box to the back just tuck it under the dashboard.
It was a pain to get to, and easier just to reach back and see the fuses. Do you see a problem with a wire from alternator to positive battery terminal (with inline fuse, what do you recommend?)?
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Old 02-14-2011, 07:25 PM   #4 (permalink)
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what size wire are you using?
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Old 02-14-2011, 09:00 PM   #5 (permalink)
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what size wire are you using?
8AWG the way it is, but probably will use the same 8AWG, but it will be alot shorter.
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Old 02-14-2011, 09:07 PM   #6 (permalink)
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i put my battery in the trunk with the fuse box under my dash and im using 8 gauge wire,and my alt is 120 amps and i never had a problem.. try a larger wire like 4 gauge and see if that helps you out..
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Old 02-14-2011, 09:24 PM   #7 (permalink)
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The 65AMP output on your alt is not the amps put out all the time. Its CAPABLE of doing that under LOAD. ie; A/C, defroster, etc. So you should run a 65amp fuse on a 65 amp output alt.
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Old 02-14-2011, 09:29 PM   #8 (permalink)
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Yes, that's how Honda wires it. Maybe go with a little larger gauge wire being the current travels a farther distance. You got it right with the fuse, don't want to carbq you project.
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Old 02-14-2011, 09:36 PM   #9 (permalink)
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Yes, that's how Honda wires it. Maybe go with a little larger gauge wire being the current travels a farther distance. You got it right with the fuse, don't want to carbq you project.
Agreed, I'm going to make it shorter so I'll just stick with 8 AWG, because there isn't alot of fuse holder that work with 4 AWG. Thanks guys.
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Old 02-14-2011, 10:00 PM   #10 (permalink)
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Running that wire will not cause any issues, actually the main battery fuse in the fuse box directly connects to the wire in the fuse box under the hood, wich then goes straight to the battery so no difference if you add in a fuse. i would suggest 8AWG from a welding supplier. i got 30 foot of 4g for 30 bucks and it was welding leads, great stuff.
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