Blew the fusable link - then flew a 30a Fuse - Plz HELP? - Team Camaro Tech
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post #1 of 11 (permalink) Old Aug 5th, 14, 02:27 PM Thread Starter
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Cory
 
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Blew the fusable link - then flew a 30a Fuse - Plz HELP?

OK here is the story guys. I have a 68 first gen with a big block. Previous owner added a stereo and electric cooling fans on a temperature controlled switch. Some time back I melted the fusable link. I replaced it with a Fuse holder and a 30 amp Fuse. Its bin like that for a LONG time. I was working on a electric fuel pump switch but haven't hooked anything up yet. I turned the ignition switch on (not started) and it blew the fuse. I only had a 25a in my box so I tried it and it blew that Joker as soon as the bladed touched. Seems like I got a short??? I have chased that large Main red wire around because it seemed to be going to ground. I fallowed it threw the firewall fuse box and threw the harnesses. I have removed the ignition switch and the headlight switches. Also unplugged the red wire from the inner part of the fuse box where the tube fusses are seated. I cant seem to find a short to ground???

Here are my questions - to start with, What size fuse should I have in place of that fusable link? I removed the fusable link at the horn relay and replaced it with a Fuse holder but not sure what size fuse it should be?

Other question is any Ideas on the short? any Known problems? I literally did nothing but moved a few wires around and then I started popping fuses. Are there any Known Issues?

My next step is to buy some new fuses, and start re-connecting everything one Item at a time and see what Pops the fuse? I not sure what else to do at this point?

Please if you have input on any of this - Please tell me what you think or what you have experienced.

Thanks, Arkangel77
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post #2 of 11 (permalink) Old Aug 5th, 14, 06:03 PM
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

There are a few fusible links in the car so I don't have clue which one you blew. If it's one of the ones at the horn relay that could feed the interior of the car. With electric fans and pumps it's far from stock and we wouldn't have any idea where those devices were tapped into.

Fusible links don't have an amperage value really. They are designed to blow or melt before the primary wire does. You may have a 16ga wire with a 20ga FL. It may take a short of 50amps for 3-5 seconds before it blows. Depending on what the wire feeds determines how many amp fuse you should use.

Trouble shooting by blowing more fuses is not a good idea. Get the AIM or other wiring schematic and a multimeter and track it down that way.

Known issues? Not really. I just got done with a problem that ended up being the ignition switch, it developed a dead short.

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post #3 of 11 (permalink) Old Aug 5th, 14, 06:40 PM
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

When a fuse blows that quick and hard it is a dead short to ground. Go back to your last modification, the electric fuel pump, and check it well including any wiring mods you made to connect it.
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post #4 of 11 (permalink) Old Aug 5th, 14, 07:26 PM Thread Starter
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

Thank you for the Input. The fusable link I Was referencing it at the horn relay and its the main line that feeds power into the interior of the car. I have bin trying to use my Meter to chase what I assume is a dead short but I cant seem to find anything? Only thing I know is as soon as I turned the key even a little the fuse popped. The electric fan is on a temp switch so Its not pulling power and the "Electric" Fuel pump is not in place yet and its nothing is connected to any of the cars electronics or wiring yet. I was identifying wires when this started.
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post #5 of 11 (permalink) Old Aug 6th, 14, 03:36 AM
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

Use a test light for troubleshooting rather than another fuse or link.
The bulb filament will limit the current demand.
When light goes out, short found.
Retrace your steps. No common issues.

If fuseholder has been in place for a long time, it may be corroded internally.

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post #6 of 11 (permalink) Old Aug 6th, 14, 03:13 PM Thread Starter
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

well just as a fallow up. I went threw it all again. Checked everything using some of the methods mentioned above. I found nothing! the short went away today! I have a 20a fuse in my holder and having no problems at all! I have re-taped all the wires and re-connected all the switches and fuse box and so forth. I think and its only a guess maybe my ignition switch is on the fritz. Reason I say that is everything was fine till i touched the ignition switch yesterday. It was stiff and funky. After removing it and re-installing it it was smooth again and no short. I am gona try replace it with a new one (its the original switch) and hope for the BEST! Thanks for the advise guys =) it was helpfull
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post #7 of 11 (permalink) Old Aug 6th, 14, 05:13 PM
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

Good luck. You can still get ACDelco ignition switches for ~$20.

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post #8 of 11 (permalink) Old Aug 6th, 14, 06:38 PM Thread Starter
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

Cool. I haven't looked yet. Who sells them for that?
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post #9 of 11 (permalink) Old Aug 6th, 14, 06:43 PM
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

eBay. Search ACDelco Pro D1415B.

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post #10 of 11 (permalink) Old Aug 6th, 14, 06:47 PM Thread Starter
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

Awesome. Thanks Garth
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post #11 of 11 (permalink) Old Aug 6th, 14, 06:56 PM Thread Starter
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Re: Blew the fusable link - then flew a 30a Fuse - Plz HELP?

PS. Just looked and found one on ebay for 17.50 =) awesome
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