car battery fuse amp

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=106812
Printed Date: May 14, 2025 at 1:28 PM

Topic: car battery fuse amp

Posted By: alscrx
Subject: car battery fuse amp
Date Posted: August 15, 2008 at 8:34 PM

I am relocating my SEALED battery inside the car. I am trying to find out the correct way of choosing the fuse size for the positive terminal. I know i need to put an inline fuse about 6inches off the positive terminal but what amp fuse do i use safely?

Replies:

Posted By: i am an idiot
Date Posted: August 15, 2008 at 8:40 PM

What size wire are you running to the starter? What size wire are you running to the fusebox under the hood?

Posted By: alscrx
Date Posted: August 15, 2008 at 10:50 PM

Well i purchased 4 gauge to run from the battery to the starter and fuse box. But i am reading i should use a 0 or 2 gauge.

So if i go with the 0 gauge from the battery to the distrubution block. Then run a 4 gauge to starter and a seperate 4 gauge to the fuse box, How do i fugure out the fuse size?

I was looking into a digital distribution block that displays amps and volts. It holds the ANL fuses which cost alot!

Posted By: i am an idiot
Date Posted: August 15, 2008 at 10:58 PM

If you use 4 Ga. wire you need to fuse it at 150 amps.

Power & Ground Cable Specs
Cable Size
Wire Gauge      Current Capacity
Amperage (amps)
1/0      350
2      225
4      150
8      100
10      60
12      40
14      25
16      15

Posted By: alscrx
Date Posted: August 16, 2008 at 9:38 AM

Wow 150amps seems high, looks like alot of people ran 100amp ANL fuse.

What is that based on, just wire size and how many amps from a 12 volt battery or what? How did they figure those numbers out?

Posted By: i am an idiot
Date Posted: August 16, 2008 at 7:42 PM

https://www.the12volt.com/info/recwirsz.asp

Posted By: alscrx
Date Posted: August 22, 2008 at 9:08 PM

Also, i am using a fused mini ANL distribution block under the hood. I decided to run a 1/0 gauge as my main. Then distributing it to two 4 gauge wires. One for starter one for fuse box.

How many amp should i get the mini ANL in? Each 4 gauge has its own mini ANL. I have no idea whats the amperage for the starter wire!

Posted By: KPierson
Date Posted: August 22, 2008 at 9:24 PM

The chart lists the MAX fuse size you can use - if you arn't planning on pulling 150A from the battery there is no reason to use a fuse that big.

-------------
Kevin Pierson

Posted By: alscrx
Date Posted: August 22, 2008 at 10:00 PM

Oh ok, well how do i figure out how many amps my starter is pulling so i can use the correct size fuses??