Rationale of fuse placement
07-06-2004, 06:32 AM
#1
50 Watt CAFz'r
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Join Date: Apr 2004
Posts: 194
I just was wondering the rationale behind placing the fuse as close as possible to the battery on the power cable. I would like some of your opinions or knowledge on why many people place the fuse on the + power cable.
Would it not be better to place it on the - ground cable in the trunk? Or even better on the ground cable just after the battery? I say this since current flows from - to +, so is there a reason for fusing on the receiving end of the current?
Thnanks guys,
Fabiano.
Would it not be better to place it on the - ground cable in the trunk? Or even better on the ground cable just after the battery? I say this since current flows from - to +, so is there a reason for fusing on the receiving end of the current?
Thnanks guys,
Fabiano.
07-06-2004, 07:00 AM
#2
It's on the + because ground is everywhere. It's not that so many people place the fuse along +, EVERYBODY does...I hope.
You would also not fuse the ground because it'll just be a restriction in addition to it being useless.
Can anyone else explain this?
You would also not fuse the ground because it'll just be a restriction in addition to it being useless.
Can anyone else explain this?
07-06-2004, 07:39 AM
#3
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The fuse at the battery is to protect the car not the system. If you were ever in an accident where the main power wire was pinched to the metal and dead shorted, it is called welding, which makes alot of heat, which makes your car start on fire in some instances. Which is why there is a fuse at the battery.
07-06-2004, 09:18 AM
#5
You also want the fuse to be as close to the source as possible, so that if any of the wire burns, it is just a short length, rather than fusing farther back along the line, i.e inside the vehicle, where it could burn through the firewall/carpet, etc.
07-06-2004, 09:41 AM
#6
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Join Date: Apr 2004
Posts: 194
I hadn't thought of those instances, and I'm happy to have been enlightened. Thanks Chad, DWVW, Rockney and JeepBeats!
I was being narrowminded in thinking only of the situation in which current would be flowing quickly through the cable but didn't think how (ex pinched cable).
Now I am enlightened.
Thanks to all.
I was being narrowminded in thinking only of the situation in which current would be flowing quickly through the cable but didn't think how (ex pinched cable).
Now I am enlightened.
Thanks to all.
07-09-2004, 10:41 PM
#7
0 Watt CAFz'r
Join Date: Jun 2004
Posts: 24
I'm wiring a Dodge Ram.Would anything be wrong with running the power wire from the factory distribution block instead of the battery.The reason is I have a Scosche wiring kit that came with a 12" piece of power cable with a spade lug on it and a 14" piece with nothing on it.Also I'm trying to use stretch every inch out of it cause it's gonna be close.
07-10-2004, 12:31 AM
#9
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You can go to the factory distribution block as long as the factory wire is the same or thicker from the battery to the distribution block. I have seen everything from 10 guage to 4 guage depending on the vehicle and options available.
[ July 10, 2004, 01:31 AM: Message edited by: DWVW ]
[ July 10, 2004, 01:31 AM: Message edited by: DWVW ]
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