| Main power fusible link [message #365164] |
Fri, 02 July 2021 06:21  |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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The electrical diagram shows a Black #16 fusible link from the "Battery Pickup Junction Block" to the Horn relay bolt terminal.
Mine is a Yellow wire and looks more like a plain old #12 wire... SO I'm thinking the fusible link was replaced with a piece of wire in the past. A #16 seems a bit small with two #12 wires coming off it. Is #16 still a good choice, or should I goto #14 size link?
Thanks.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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| [GMCnet] Re: Main power fusible link [message #365170 is a reply to message #365164] |
Fri, 02 July 2021 07:12  |
Russell Mehlenbacher
Messages: 128
Registered: June 2010
Karma: 1
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Senior Member |
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Not a real answer, but I experienced the fatigue failure of one end of that
wire as I was high tailing it North on I-75.
Backfire, engine quits, gauges all read zero, no 4 way flashers, nothing
but house power.
Took a bit to puzzle out and crimp a new end on. Replacement is on the
list, so I'll be watching for opinions.
Russ
On Fri, Jul 2, 2021, 7:21 AM Bruce Hislop wrote:
> The electrical diagram shows a Black #16 fusible link from the "Battery
> Pickup Junction Block" to the Horn relay bolt terminal.
>
> Mine is a Yellow wire and looks more like a plain old #12 wire... SO I'm
> thinking the fusible link was replaced with a piece of wire in the past. A
> #16 seems a bit small with two #12 wires coming off it. Is #16 still a
> good choice, or should I goto #14 size link?
>
> Thanks.
>
> --
> Bruce Hislop
> ON Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
> My Staff says I never listen to them, or something like that
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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Russ & Linda Mehlenbacher
Rochester Hills, Michigan
'76 Eleganza
'74 Sequoia
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| [GMCnet] Re: Main power fusible link [message #365180 is a reply to message #365170] |
Fri, 02 July 2021 08:36 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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The primary fusible link is a number 16 ga black. DO NOT go to a larger size! GMC designed safety into their electrical systems. The 16 gauge is the weir size that has a fuse rating. Going bigger just created more smoke!!!
What is a fusible link:
A fusible link acts much like a fuse; only it’s designed to handle a different type of potentially hazardous scenario. These links are actually strands of wire wrapped in a fireproof covering and are thinner (smaller gauge) than the wiring harnesses they’re connected to. They are placed in-line between delicate harnesses and large electrical current sources in your car—between the battery and alternator, for example.
These links must transmit high-current electricity and protect the rest of the electrical system from dangerous spikes that could cause a fire. If there’s a surge, the link actually melts, as its resistance to heat is lower than that of the circuits it’s protecting. This cuts off power while protecting the engine bay from a fire, thanks to its fireproof wrapping.
Unlike a regular fuse they are not instantaneous but heat up before failure.
The NAPA # is BEL 784695 and retails for $4.09 US and you should be able to find it at any good autoparts store in CA.
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Jul 2, 2021, at 8:12 AM, Russell Mehlenbacher wrote:
>
> Not a real answer, but I experienced the fatigue failure of one end of that
> wire as I was high tailing it North on I-75.
> Backfire, engine quits, gauges all read zero, no 4 way flashers, nothing
> but house power.
> Took a bit to puzzle out and crimp a new end on. Replacement is on the
> list, so I'll be watching for opinions.
> Russ
>
> On Fri, Jul 2, 2021, 7:21 AM Bruce Hislop wrote:
>
>> The electrical diagram shows a Black #16 fusible link from the "Battery
>> Pickup Junction Block" to the Horn relay bolt terminal.
>>
>> Mine is a Yellow wire and looks more like a plain old #12 wire... SO I'm
>> thinking the fusible link was replaced with a piece of wire in the past. A
>> #16 seems a bit small with two #12 wires coming off it. Is #16 still a
>> good choice, or should I goto #14 size link?
>>
>> Thanks.
>>
>> --
>> Bruce Hislop
>> ON Canada
>> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
>> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
>> My Staff says I never listen to them, or something like that
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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