Blown fuse - Team Camaro Tech
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post #1 of 16 (permalink) Old Mar 26th, 15, 10:11 AM Thread Starter
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Jeff
 
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Blown fuse

Every time I go to start my 68 Camaro it blows the main 40 fuse. I've replaced it 4 times now and cannot figure it out. Help?
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post #2 of 16 (permalink) Old Mar 26th, 15, 10:32 AM
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Re: Blown fuse

Had a starter do that once. Changed it and fixed the problem. Not sure if thats your problem though. Good luck.

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post #3 of 16 (permalink) Old Mar 26th, 15, 11:11 AM
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Al
 
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Re: Blown fuse

Which fuse? Main 40A? Never heard of such a beast on a gen 1 Camaro. The starter motor circuit is not fused.


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post #4 of 16 (permalink) Old Mar 26th, 15, 12:01 PM Thread Starter
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Yeah it's blowing the main 40A. As soon as the dash lights come on, they go back out and its blown.
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post #5 of 16 (permalink) Old Mar 26th, 15, 12:13 PM
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Re: Blown fuse

Any recent electrical or electromechanical changes made to the vehicle?


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post #6 of 16 (permalink) Old Mar 26th, 15, 12:50 PM
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Re: Blown fuse

Hi Jeff
Like Al wrote, I thought the largest fuse is a 25 Amp.

You need to Isolate your circuits, Sounds like one has gone to ground.

1 - Does the Fuse Blow when you turn your Ignition Key to the Run Position ?
Then it Blows when you rotate it to the "Start" Position ?
and do you hear the Starter make any noise ?

2 - I would Remove the Purple Wire to the Starter, with a new Fuse or Short Circuit Tester in place of the Fuse, Turn the key to where it was blowing the Fuse. If that is OK, I would Change the Starter Solenoid/ Starter assy.

3 - If your problem continues, then you should remove the Wire Harness Ignition Switch Plugs and ring out each Circuit to see which one is Grounded.

4 - I would say the Ignition Switch is the Cause. If you can get one from somebody and try it.

What is happening is when you install a new Fuse and Turn your Key, it is taking that Voltage and running it into a Wire (Purple) past the Neutral safety switch to "pull" the Starter Solenoid into Contact to turn the Starter.
Timmy
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1969 SS/RS Coupe 427BB 700R4 12 Bolt 4:11 A/C, High School Resto Mod

November 1968 Build Date
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post #7 of 16 (permalink) Old Mar 26th, 15, 01:20 PM Thread Starter
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It blows as soon as the key goes to the run position, there is not enough time to get it to crank before it blows
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post #8 of 16 (permalink) Old Mar 26th, 15, 01:23 PM
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Al
 
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Re: Blown fuse

There is no "40 main fuse". Which fuse is blowing - as in what position on the fuse block.


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post #9 of 16 (permalink) Old Mar 26th, 15, 01:25 PM Thread Starter
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It's hard to tell if it's the starter because the fuse blows before I can turn the key past run.
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post #10 of 16 (permalink) Old Mar 26th, 15, 01:27 PM Thread Starter
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It's not one of the fuses on the fuse block. Look by the driver head light and there is a little black capsule with an orange fuse. That one is blowing each time.
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post #11 of 16 (permalink) Old Mar 26th, 15, 01:33 PM Thread Starter
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This is the fuse
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post #12 of 16 (permalink) Old Mar 26th, 15, 01:36 PM
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Al
 
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Re: Blown fuse

Is that part of the factory harness? I'm not aware of a replaceable fuse there. There are fusible links in that area near the horn relay, maybe a P/O blew a fusible link and installed a fuse there - who knows. Can you post a picture? Trace the wire and see where it connects?

Edit - yeah - that's not factory - someone added that. Would be easier to help if we knew what it was for.


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post #13 of 16 (permalink) Old Mar 26th, 15, 01:59 PM
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Re: Blown fuse

Thats not factory at all. Where does it come from and where does it go?

Jason
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post #14 of 16 (permalink) Old Mar 26th, 15, 02:46 PM
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Re: Blown fuse

Quote:
Originally Posted by BPOS View Post
Is that part of the factory harness? I'm not aware of a replaceable fuse there. There are fusible links in that area near the horn relay, maybe a P/O blew a fusible link and installed a fuse there - who knows. Can you post a picture? Trace the wire and see where it connects?

Edit - yeah - that's not factory - someone added that. Would be easier to help if we knew what it was for.
Hi Jeff

As Al and Jason have asked, Where did this Modification come from ?

Your Car is a 1968 ?

Original Wire Harness - Patched into - Something Added or an Aftermarket Harness ?

When was the Last time your Car was OK,
as in What was done that changed the Configuration of your Electrical System or a Component replaced. Did you drive it to where it is and Now you have a Problem without having Done Anything ?

That Fuse and Location are not Stock.

I added a Picture of the 69 Wiring Diagram and Highlighted a few areas -
The Large Red Circle is where your Power distribution comes from, the Smaller Red Circle is Where that Power goes and the Yellow is how it gets from the Battery to the Voltage Regulator across the Radiator Support in the Stock application.
We need more Info and Pictures to help without totally guessing.
Timmy
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post #15 of 16 (permalink) Old Mar 26th, 15, 03:41 PM Thread Starter
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Alright, I got it figured out, thank you.
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