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So I finally ordered my new alternator, I got the biggest one I can find. My question is when I connect a new power wire from the alt to the battery do I need to fuse it? I have read some threads about the matter but nothing has been updated in awhile and there was no real definite answer. The setup would go like 260a Alternator--->battery--->goofy nissan fuse thingy. Thanks for any help.
 

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Interesting question, I am going to give you my thoughts, as I never heard of this being an issue.

No, why would a fuse be needed between the Alt and Battery. Battery supplies Voltage to maintain charge in Battery. A voltage regulator inside the Alternator, regulates the Amperage that can be produced at a given RPM. Amp draw by battery is in relation to load, as always. You simplycan produce more, and at a lower RPM, becuase the windings are different. I just don't see need for a protection device at that point. The logic is same as OEM circuit. ???
 

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The OEM setup uses a fusible link to protect the charging circuit:
 

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I fused my 0awg feed I added from my alt to battery as I wanted to be as safe as possible.
 

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TitanBlue said:
No, why would a fuse be needed between the Alt and Battery.
In case a cable between the alternator and the + battery terminal shorts (e.g. the insulation gets rubbed off the cable and the conductor of the cable contacts the frame or block).
 

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Thanks Bestatchess. Most of the alternators I'm around, simply run direct to the battery, no links. But I've seen them on stepvans, and in the fuse box of many cars. Just didn't expect it at that point, usually so short.
 
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