IngSoc

When upgrading the wire to your 80a alt fuse to the +battery how do you go about connecting it to the fuse in the box? any pix?

Elton

just run a separate wire and keep the factory wire intact

myyota

When i replaced that wire on my 4Runner i cut the factory wire off and made a new power wire with a piece of 4 gauge wire and heavy duty copper ring terminals soldered on. I cut the factory wire off because there wasn`t much holding wire left holding it in place. I can get a picture tomorrow if you want to see how i did it.

IngSoc

Yea I think I'm confused on how its done. Seems like the whit wire is clamped on to a plate that's screwed in to hold the fuse into place. Think 2 ga is overkill? Yea pls post pix and thanks for your help, really appriated

xxxtreme22r

quick question regarding that wire, kind of on topic, that wire goes to a fuse or a fusible link in the fuse box?

myyota

[QUOTE=xxxtreme22r;51577386]quick question regarding that wire, kind of on topic, that wire goes to a fuse or a fusible link in the fuse box?[/QUOTE

Ok, the power wire coming from the alternator connects to one side of the 80 amp fuse, the other wire coming from other side of the 80 amp fuse connects to the battery. This wire (the one were replacing) completes the charging circuit to the battery and also feeds power to the fuse box it self. This wire wears out from age and starts to break causing voltage problems, that`s why its a good idea to replace or upgrade the wire. in stock form the factory wire is a fuseable link.

xxxtreme22r

ok that explains why it's bolted inside the fuse box then.

Elton

4ga is fine unless ur gonna do some crazy stuff then u want like 1/0 but u wanna run a fuse holder like so from the battery then to the alt

myyota

Here are some pictures of the fuse box wire upgrade i did on my 86 4Runner.

richf

This may sound like a dumb question and I think I already know the answer but I'm going to ask it anyways. First off I just bought a 130 amp from grand rebuilders, hopefully I get it by the weekend.

Question: If I have 130 amp alt. will I need to change the fuse under the hood to a 130 amp fuse?

I just installed a 4g negative battery cable connection to the engine/mount. I have a 4g positive cable going to the starter and fuse box also.

myyota

Let me answer your question this way, a stock alternator is 60 amps and the fuse it runs through in the fuse box is 80 amps, so the fuse is rated 20 amps over the output of the alternator. So if your installing a 130 amp alternator you need to upgrade the fuse 10-20 amps over what the alternator is rated at. Im running a 95 amp alternator in my 86 4Runner and im going to upgrade the fuse to 100 amps.

richf

I have a 100 amp fuse in the truck now. Do you think they even make this style fuse in 140-150amp?

And you guys are also suggesting to install a secondary fuse from the battery to the alt? I'm guessing it needs to be some were in the 140-150amps range?

blake.nemitz

you could run 2 70 or 80 amp fuses in parellell"not series" and meet your 140-150 amp goal.

richf

That's past my comfort level with electrical stuff. I would rather keep it simple with the correct style/size fuse.

8622rtec

You could do this...but imo (and others) its better to run one fuse on series because there is no way to guarantee that the current will be shared equally.

Essentially "...[Two fuses, even if they are nominally identical, don't have the same resistance. And two fuse holders, even if they are nominally identical, don't have the same resistance. So the current through the two fuses won't be identical - it will divide in (inverse) proportion to the resistances.]"

IngSoc

So I'm correct in assuming the other end of the wirr goes to you + of the battery? Also good question on the fuse cuss I got a 130a alt and still running stock 80a fuse. DK do they make that stylr.fuse in 150a?

myyota

Look on amazon.com or do a google search and you will find the fuse you need. If you want to install another fuse that`s up to you, it never hurts to play it safe.

myyota

The largest stock type fuse ive been able to find is a 120 amp fuse, if you need one bigger you will have to use a different style fuse and fuse holder. Yes, the other end of the wire goes to the positive battery terminal.

richf

Sorry if I high jacked with my questions but I thought it would be pointless to start a new thread.

I think the cable for the alternator terminates some were in the fuse box under the hood. Please correct me if I'm wrong. Also I noticed on my truck that the wire from the alt. goes into a black box (I couldn't get it open at the moment) on it's way back to the fuse box. What's in the black box?

Ingsoc: I looked on advance autoparts website and I couldn't find the style fuse we would need but I do know they sell that style. I just wish I new what they were called.

myyota

The cable from the alternator runs to one side of the 80 amp fuse, the other side of the 80 amp fuse has the wire that connects to the battery. The little black box on the driver side inner fender is just a stud terminal were the two wires connect.