Big 3: Alternator to Battery

[TheJuggla1 10+ year member]

If I go to upgrade my Alternator to Battery I was thinking about how small the default wire was on my truck. I am wondering if I should run into any fuses blowing if I were to upgrade this small wire from the alternator to the battery to like say 4 gauge or so?

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[Stalin-ohaulic]

If I go to upgrade my Alternator to Battery I was thinking about how small the default wire was on my truck. I am wondering if I should run into any fuses blowing if I were to upgrade this small wire from the alternator to the battery to like say 4 gauge or so?

Not at all. It is a good idea to fuse your alt to batt wire for the gauge of wire you're running. If it shorts, you are looking at a dead batt at least and in some cases an exploded batt. A fuse never hurt anybody.

 

[TheJuggla1 10+ year member]

Think I worded that wrong, I meant will this blow any fuses in my system due to more power being sent to the battery? Will this hurt my battery by putting too much charge into it?

 

[Stalin-ohaulic]

Think I worded that wrong, I meant will this blow any fuses in my system due to more power being sent to the battery? Will this hurt my battery by putting too much charge into it?

I understood what you meant and I said no. Power is not "sent" anywhere. It is drawn. You are merely lowering the resistance so less power is wasted. Nobody would recommend doing this if it would cause problems.

 

[texicanz 10+ year member]

i did not use a fuse the alt wire to the battery when i did the big 3 to my car and my old stock alt wire to the battery did not have a fuse but what i would do is add the 4 gauge wire with your stock wire

 

[inkfx 10+ year member]

I'd say use a fuse. Better safe than sorry.

 

[shiny2]

When diagnosing battery trouble, you must check the alternator to see if it is charging correctly. If the alternator is not working right, the battery slowly drains down. If your battery is drained, it will not run the important electrical systems in your car. Read on to learn how to check if your alternator is charging your battery.

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[Stalin-ohaulic]

i did not use a fuse the alt wire to the battery when i did the big 3 to my car and my old stock alt wire to the battery did not have a fuse but what i would do is add the 4 gauge wire with your stock wire

Almost all stock wires have a fuse. Usually it runs from the alt to a fuse box. Telling people not to fuse a wire is irresponsible. If it shorts, what happens? It's fine that you didn't because it might rid the world of one more, but don't recommend other people do the same.

 

[dafobbishon3 10+ year member]

use fuse.

 

[texicanz 10+ year member]

well not all car's have a fuse at the fuse box for the alt. because the 90s jeep grand cherokees dont have them but alot of people dont fuse it and some doso its really up to u if u want to fuse it

 

[TheJuggla1 10+ year member]

use fuse.

What size fuse for 4 gauge? 150 A?