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Starter Relay-to-Alternator Fusible Link

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Lyle View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2017 at 12:21pm
Here is a site to give you the information you seek:
http://www.madelectrical.com/catalog/fusible-link.shtml
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304-dude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2017 at 12:49pm
Originally posted by DaemonForce DaemonForce wrote:

I need to setup something like this to use as a junction block at my starter. I'm perfectly fine with minimal or no fuses in the injection system but the factory dash, trigger controls and gauges need these critical fusible links. The lights will be updated with their own harness updates and junctions so I'm not worried about them. What is the best way to bolt and wire this in? Mount the link base to the firewall near starter and then wire in the multiple links with 12-14awg?


It is best to place the fuse as close to the load as possible. My setup has room for the fuses to be placed close to the items being protected, near or at the voltage regulator and solenoid.
71 Javelin SST body
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Lyle View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2017 at 9:09pm
Please prove the following from the Electrical Engineering Reference and Application Handbook as being wrong:
"The fuse should always be the first thing a power supply hits when it gets to a circuit. The reason is pretty simple. In the event of a fault that blows the fuse, the power is isolated to where it entered the circuit, thus the whole circuit is protected."

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billd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Sep/30/2017 at 1:02pm
Lyle is right - you do NOt want the fuse as close to the load as possible. You want it closer to the source of power to protect the entire thing. 
Place fuses as close as possible to the source of power for the specific load. It's the circuit you are protecting, not the load itself. 
Thus, place the protection as close to the "battery" or source of power as possible.
Obviously for interior items, radio, dome lights, etc. it's got to be in the cabin - but it's still closer to the ign or bat source than to the LOAD itself. The battery wire coming in is protected by fusible link, then the individual circuits from there are protected at the fuse panel, not even close to the load. 
The alternator is a source of power, the battery is a source of power so the initial protection is the fusible link so if the wire to the fuse panel is bitten or pinched, it's protected clean back to the starter solenoid/relay (or source of power, practically speaking)

I love the way Lyle's quote explains it - simple, easy to understand, and precise all at the same time. 
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mrblatzman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mrblatzman Quote  Post ReplyReply Direct Link To This Post Posted: Sep/30/2017 at 3:44pm
Is the link in question the red one or the pink one?   Bob in Alabama
Thankyou....Bob
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