Fuse for alt to battery power wire

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=12541
Printed Date: May 16, 2024 at 3:41 AM

Topic: Fuse for alt to battery power wire

Posted By: J B M
Subject: Fuse for alt to battery power wire
Date Posted: April 21, 2003 at 10:21 PM

I just heard someone say to make sure to fuse the power wire from alternator to battery. Is that necessary and what size fuse should you use if the alt is a 200+ amp alt...?

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Team Atomic
Team Powerbass
Team Pure Pressure
Team Excessive Amperage

Replies:

Posted By: Big Purds
Date Posted: April 22, 2003 at 1:40 AM

do not fuse that line...

there is no need for it...

Posted By: Wantofok
Date Posted: April 22, 2003 at 2:46 AM

I'm thinking he prob. meant the battery wire to amp or whichever accessory you have next inline.

Posted By: copcarguy
Date Posted: April 22, 2003 at 4:53 AM

Never heard of anyone fusing that line. Even in the high amperage draw vehicles we build. Fuse everything downstream of the battery or ignition though.

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R Jackson
Owner/Installer
TRM Emergency Vehicles
Information is advice only and should be confirmed with OEM or quality test equipment.
Boyertown, Pennsylvania

Posted By: jgold47
Date Posted: April 22, 2003 at 9:42 AM

besides your car will probably already have a fuse for that line, mabyee one for "batt" that might be equivlent to the old alternator output (ie in my acura i have a 90 amp alternator and a 100 amp fuse) if you increase the alternator, you might want to find that fuse and make sure its ok to handle the increased output (ie if I went to a 135amp alternator I would need to replace that fuse with a 140 or so amp fuse to protetct the battery......just look for the right fuse, depending on your car its probably under the hood or somewhere like that and it would say battery or alternator and should roughly corespond to amperage output of the alternator.....

Posted By: Big Purds
Date Posted: April 22, 2003 at 4:45 PM

I have NEVER, lemme repeat that in BOLD, NEVER seen a car with a fuse inline between the battery and the alternator...that line should not be fused...

can anyone tell me why the hell you would fuse that line???

Posted By: IronCy
Date Posted: April 22, 2003 at 8:46 PM

Im with Big Purds on that, no need to fuse b/t the alternator and the battery.

-Cy