Fusible Link Q - Team Camaro Tech
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post #1 of 11 (permalink) Old Nov 19th, 09, 07:30 PM Thread Starter
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Fusible Link Q

With fusible links, the rule of thumb is the link is to be 4 AWG sizes smaller than the wire it is protecting as per information in this website and others.. http://www.madelectrical.com/catalog/fusible-link.shtml

In the wiring diagram of my 69 Camaro (UPC12-D1) the 12 gauge Red that steps down to a 16 gauge Black as it comes out of the horn relay is considered correct..

However, why does the 10 gauge Red (just downsteam of the main splice) step down a whole 10 AWG sizes to a 20 gauge Orange before connecting to the voltage reg? Shouldn't that be a 14 gauge?

Can someone please edjumacate me.



Oh! ..and another question.. What are the actual amperage ratings of fusible links? Do they conform to regular AWG rating for their size?
http://en.wikipedia.org/wiki/American_wire_gauge

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #2 of 11 (permalink) Old Nov 20th, 09, 03:13 AM
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Re: Fusible Link Q

The link is of smaller size because if the field relay is ever stuck closed, the link opens up and protects the alternator.

Yes, current is determined by wire size/circular mils; 20 AWG = 4.6 amps.

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post #3 of 11 (permalink) Old Nov 20th, 09, 10:29 AM Thread Starter
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Re: Fusible Link Q

Yes thanks, but why does a 10Ga step down to a 20Ga?

Seriously, is it correct to choke a 15Amp wire with a 1.5Amp?? http://diyaudioprojects.com/Technica...an-Wire-Gauge/

I'm guessing the the fuse wire will burn during normal operation.

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post #4 of 11 (permalink) Old Nov 20th, 09, 12:07 PM
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Re: Fusible Link Q

No, it does not. I'll look at the Motors Manual at home for a more definitive answer.

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post #5 of 11 (permalink) Old Nov 20th, 09, 04:46 PM
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Re: Fusible Link Q

Yes, #3 terminal internally, goes to the field relay. Its coil is of high resistance, so less current is needed to energize the relay, hence, the smaller gauge wire.

As I said earlier, in case the field relay is ever stuck closed, the fusible link gives out stopping current flow and discharging the battery.

As the field relay works, it is always chattering, open & closing, at a high rate depending upon its setting for proper charging system voltage output at engine rpm. The tighter the spring setting, the longer the relay stays closed, the more field created, the higher the voltage.

Hope this explanation helps.

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post #6 of 11 (permalink) Old Nov 20th, 09, 08:52 PM Thread Starter
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Re: Fusible Link Q

Yes it does.. thank you. I'll go with what the diagram says..

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #7 of 11 (permalink) Old Nov 21st, 09, 08:44 AM
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Re: Fusible Link Q

Hey Everett, thanks for that from me too. The original relay from mine is in the memory-parts box. The replacement puts out fifteen volts. Ouch. Took it to our local DC shop. They only work on motors and such. Oh well. After adjusting the spring tension via your instructions, they're gonna get a lesson. Well, maybe not. How many cars still run these mechanical voltage regulators?

A thought; Except for posterity, why not replace the links with fuses?

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post #8 of 11 (permalink) Old Nov 21st, 09, 09:44 AM
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Re: Fusible Link Q

You're welcome, Guys. One reason the fusible links are used vice a fuse is because of the number of contacts; power terminal to fuse holder to fuse thru fuse to fuseholder to load terminal - lots of resistance and contacts where a fusible link is from power terminal to crimp to load.

Mine is still a mech VR, but at the time era, one watched the battery fluid level, if low and case was hot, too high of setting. If fluid was at the right level and battery needed a charge every couple weeks, too low of voltage setting.

There is a procedure to setting the VR by watching reg temperature and setting a carbon pile resistor, aka, VAT-28 or -40.

Someday, I'll install a Wells/Duralast VR715 VR, electronic. It appears others here have good usage from them.

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post #9 of 11 (permalink) Old Nov 21st, 09, 11:50 AM
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Re: Fusible Link Q

Everett, I was thinking to bend the spring mount to change the voltage. Not OK???

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post #10 of 11 (permalink) Old Nov 21st, 09, 08:55 PM
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Re: Fusible Link Q

Yes, the stationary bottom tab the spring hooks to or adjust the screw, if equipped.

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post #11 of 11 (permalink) Old Nov 22nd, 09, 08:45 PM
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Re: Fusible Link Q

Isn't there something on that in the chassis overhaul manual or service manual?

1968 Z28 British Green, all original except CE 302 engine. Have original owners booklet and protect-o-plate.
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