What Is Fusible Link | What's Fusible Link Used For 

Let us know how it all works out for you.

Thank you for watching

Awesome. Good luck. We sure would like to see your “Ride” when you get it done. Thank you

@@HagemeisterEnterprisesINC I will be sure to send you pictures.

It's not needed but yea it gives protection for if the battery is hooked up wrong or wires touch when they shouldn't or your wiring harness shits the bed

Glad it helped

The car has a generator not an alternator, with a external voltage regulator, so those two power feed wires run the fuse panel and the voltage regulator for the charging system and it connects right at the battery cable on the solenoid to protect the whole system.

From my research on this very thing this week, my 100 amp alternator would require at least an 8 gauge wire to my starter solenoid. You are probably looking at a 4 g. The ground wire from alt to engine block can be smaller like a 8g, but research that. I run 8g and ground is 10g.

Sorry for the delay in my response. In our shop, we run 12 g fusible link. That’s what the Dodge Diesel has. If you have any questions, give us a call.

In most cases original equipment manufactures only use a maximum of two wires for a fusible link connection. With that in mind, the best way for you to figure out what size fusible link you need, is by figuring out what size wires that you were trying to connect to. Honestly most are 10 gauge but I wouldn’t guarantee it.

Yes you can, but remember fusible link is surge protection. It is not rated. If you want to replace it, you need to understand and figure out what amperage of a fuse you will need. Hope this helps.

Fusible link is surge protection from a short circuit. A fuse is amperage rated. You may be able to switch out a fuse but the short in the system still remains and you need to track the short down or you will blow fuse after fuse. You may want to watch our video specifically on Fusible Link.

One is for key on power and the other is for constant power.

No the 10 gauge wire is doing the job. The 14ga fuse link is a short wire that will not disrupt the load because it’s so short. But provides short surge protection. Watch our video on the 1950 Dodge Coronet to see how we used fusible link there. How this answers your question.

No, it’s always on the battery end.

@@HagemeisterEnterprisesINC Thank you. The thought I had is, if possibly the wire grounded somehow between the alternator and battery and it is fused at the battery only, the power would be cut from the battery, but the alternator would still feed voltage the length of wire to where it grounded out. Is that possible or am I thinking too much or incorrectly?

Are you talking about just a diagram? Or a project you are working on? If it’s a diagram, can you email me a picture of it to info@heielectric.com? If you are working on a project you should be able to just check the continuity on each side of the fusible link.

@@HagemeisterEnterprisesINC I sent you the diagram through email. I was actually using the diagram to repair one of my vehicles.

I sent understand your question as it is written here. Sorry

Modern cars lean more towards mega fuses. In some cases, we have seen as high as 10 g. fusible link. Hope this helps.

OK, your alternator in that series of truck would be about 100 Amps. I’m assuming you have a 60 amp ammeter. that would be too much current through the ammeter. However, to hook it up, the battery wire off the alternator hooks to one side of the ammeter and all your power feed loads also go on that side. The remaining side just goes to the battery like you have it. my suggestion would be to do away with the ammeter and put a voltmeter in it. Most cars have volt meters, because the amperage is too high for an ammeter. Also a volt meter is easier to hook up. Just needs small wires, one to key on and a ground wire. Hope this helps.

@@HagemeisterEnterprisesINC ...most kind of you to respond so quickly. You likely have forgotten more than I know. Is there a way to tell the amperage of the alternator? Does it say somewhere?

Fusible link burns so quickly that it shouldn't affect your adjacent wiring. And just so we are clear, fusible link itself, would *NEVER be in loom* . Typical it is connected onto the power feed. I hope this answers your question.

@@HagemeisterEnterprisesINC Thank you for your reply.

No. It is a Fuse Type material not just any wire. Hope that helps

@@HagemeisterEnterprisesINC Great, Thank You

Are you running a generator? Alternator, etc? It will make a difference.

It is protection to the Power Feed to the tractor.

Fusible Link are surge protection and are not amperage rated. If you know the amperage you need then yes you can use fuses.

Thank you for your reply. I have an 88 d21 and there’s 3 fusible links that were missing from previous owner, do you think 30 amp fuse replacement will be on the safe side?

Because fuse blocks and fuses are amperage rated. Fusible link is a surge protection. How this helps. If you have more questions please let us know.

I thought the same thing. It looks like there needs to be a drastic short or current overcharge to burn through the fusible link, whereas a fuse or circuit breaker would be a simple short. That’s the way I understood it.

You are correct. Fuses are amperage rated. We promote the fusable link as a surge protection just like the original original equipment manufactures do. Hope this helps

All the original equipment manufacturers used fusible link. If you didn’t know fusible link is for surge protection. Fuses are amperage rated. And for collector cars this is more original.

Yes, but they weren’t available in 1950.