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Old 02-04-2011, 05:31:36 PM   #1
slvrblt2
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Fusible link question

Hey guys, I know there isn't a fusible link wired under the hood but....what exactly is a fusible link??? From what I understand it's something put inline on your wiring which "trips" if somethings not right electrically??? Can anyone clear this up a bit for me? Also, where are the fusible links supposed to go in the car? And how do I go about putting one in? My car is a 79 z28 thanks!
-Andrew
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Old 02-04-2011, 05:36:03 PM   #2
daniel76309
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A bunch of good info here on fusible links and other stuff also...

http://www.madelectrical.com/catalog/fusible-link.shtml
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Old 02-04-2011, 05:44:32 PM   #3
Twisted_Metal
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There IS a fusible link under the hood.
It acts as a slow-blow, in-line fuse to protect the rest of your wiring harness.

It's the first section of wire which comes off the starter to feed the fuse block.


The factory link has a light colored, barrel-like piece of plastic with a number on it signifying the gauge of the fusible link.
Note: The gauge of the link needs to be a larger number than the circuit it protects.
(14 guage link protects a 10 ga main wire. 16 gauge link protectss a 12 gauge wire.)

If memory serves me correctly... Your 79 has a single 14 ga fusible link at the starter and it also has one at the battery ground terminal attached to the fender.

In 80... They got two 16 ga links at the starter.
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Old 02-04-2011, 05:45:51 PM   #4
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thanks for the info!...I've heard this goes on one of the wires coming from the starter but which one? Sorry guys, you'll have to bear with me, not the greatest with electrical systems, thanks

thanks twisted, you posted this as I posted this reply
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Old 02-04-2011, 05:48:26 PM   #5
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The big red one feeding your harness is where the link goes.
It's on the same starter connection as the main power cable from the battery.
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Old 02-05-2011, 12:17:19 AM   #6
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Alright, so would I put the fusible link right there where the big red wire connects to the starter?
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Old 02-05-2011, 12:30:15 AM   #7
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alright I made this up real quick, is this the right place? and if so, would it directly connect to the starter terminal? Also I have another question while I'm at it, so what exactly happens when the power from the battery is connected to the starter, does it give juice to the starter then flow through it and provide power to the fuse block? just wondering, once again bear with me haha I understand these are probably really stupid questions, another thing, what I drew in the following picture I think is wrong, the wire I'm think the fusible link goes on is the one above the one I colored in red, the red circle just circles the starter, but is the wire that I colored the ignition wire? and one last question...for now, would the other fusible link go on one of the grounds coming off the battery? thanks guys I appreciate it!
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Old 02-05-2011, 12:42:20 AM   #8
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Quote:
Originally Posted by slvrblt2
Alright, so would I put the fusible link right there where the big red wire connects to the starter?

Yes.




In your diagram...

The "thermo wire" on the battery ground is one fusible link.

The one you colored red at the starter is the wrong one.
It's the one that shares the same connection as the postive battery cable. (Top one in the diagram.)
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Old 02-05-2011, 12:50:46 AM   #9
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Alright, yeah I noticed while looking at the wiring diagrams the words "thermo wire" and I wondered what that meant, thanks a lot for the info Twisted, I'm not sure if I'll be getting to it this weekend, goin on a snowmobiling trip, but when I do get to it I may have more questions, thanks again!
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Old 02-05-2011, 01:00:28 AM   #10
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Don't mean to pick this apart, but there is another fuse link at the bulkhead on the other end of this same 10 ga. wire. Follow it here.
http://www.nastyz28.com/camaro/wire/78w-eng.jpg
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Old 02-05-2011, 01:08:20 AM   #11
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You're right!
I've never disconnected the bulkhead plug to find that one!
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Old 02-05-2011, 01:10:34 AM   #12
Rene Melten
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Quote:
Originally Posted by Twisted_Metal
You're right!
I've never disconnected the bulkhead plug to find that one!
Actually I added another where it goes to the alt. just for extra safety.
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Last edited by Rene Melten : 02-05-2011 at 01:14:40 AM.
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Old 02-06-2011, 02:54:24 PM   #13
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Quote:
Originally Posted by Rene Melten
Don't mean to pick this apart, but there is another fuse link at the bulkhead on the other end of this same 10 ga. wire. Follow it here.
http://www.nastyz28.com/camaro/wire/78w-eng.jpg

Alright, I see the one coming off the starter, where it says "14 RED (HW)" is that another way of saying theres a fusible link there? And you mentioned theres another one, I see a 16ga. one, is that it?
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Old 02-06-2011, 03:41:13 PM   #14
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Yep, circuit #2 on the diagram.
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Old 02-06-2011, 04:09:42 PM   #15
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Fusible links......

Yes, the real MF'r's that blew up behind my fuse box when I grounded out my 12V BAT wire behind my stereo in 1995. I spent 7 years afterwards trying to figure out how to fix. The big reason why my car never saw the street much from the year I bought it in 1995 to 2002.

No forums, no help, car sat in 5 different garages til it was gutted for a new harness.
I hate fusible links. I'd rather use an inline fuse.
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