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[C2] Elecrical issue on my 67

Old 07-11-2018, 01:59 PM
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1965fuelie
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Default Elecrical issue on my 67

I suddenly lost the temp gauge, fuel gauge and the backup lights this sunday driving my 67. Enerything functioned just fine, but then...not.
I have checked and cleaned the bulkhead connectors (they looked fine) but it did not help. I have measured the voltage on the fuses, and the top fuse has 12.5V measured on both side connectors. This circuit is the top fuse, right?
Where do I look now? Is there a common feed or ground cable to check?
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Old 07-11-2018, 03:53 PM
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If that's all you lost, it's not a ground issue and only the temp wire goes through the bulkhead connector. You can eliminate those. The top fuse does feed all those. Measure the voltage on the CLIP that holds the fuse on both ends and not just the fuse. If you have it on both clips, you almost certainly have a bad connection on the back side of the fuse block or a break in the pink wire coming out and going up to the gauges and to the b/u light plug under the hood. You need to concentrate on that fuse area, sometimes the fuse has a corroded connection at the clips or behind the box, or even within the fuse itself. Measure the clips on that top fuse and post back what you get.
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Old 07-11-2018, 04:10 PM
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Originally Posted by 65GGvert View Post
If that's all you lost, it's not a ground issue and only the temp wire goes through the bulkhead connector. You can eliminate those. The top fuse does feed all those. Measure the voltage on the CLIP that holds the fuse on both ends and not just the fuse. If you have it on both clips, you almost certainly have a bad connection on the back side of the fuse block or a break in the pink wire coming out and going up to the gauges and to the b/u light plug under the hood. You need to concentrate on that fuse area, sometimes the fuse has a corroded connection at the clips or behind the box, or even within the fuse itself. Measure the clips on that top fuse and post back what you get.
Thanks 65GGvert. I did measure both side of the fuse for contact through it, and then I measured the volts on the end clips on the outside, not directly on the fuse itself, to eliminate bad contact. Then I am lost. Will chech the pink wire you mention for power.
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Old 07-11-2018, 09:58 PM
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Originally Posted by 1965fuelie View Post


Thanks 65GGvert. I did measure both side of the fuse for contact through it, and then I measured the volts on the end clips on the outside, not directly on the fuse itself, to eliminate bad contact. Then I am lost. Will chech the pink wire you mention for power.

The easy one to get to is in the two wire plug by the master cylinder where the b/u light connectors plug together. If you don't have it there, you've lost it behind the fuse box or in the wire coming out. The pink wire with the arrow goes directly to the ignition switch, so if you had the 12v on both clips of the top fuse, you have to have a break in the circuit between the clip and the connector behind the fuse box (on the right hand side of the fuse as you look at it installed) or in the wire coming off and going to the circuits you have not working. If it is in the fuse box, it will be on the other end of that fuse where the pink wire connection is hidden by the red wire and brown one. I would make very sure it's not a fuse connection before I started disassembling anything. I would go so far as to clip a jumper momentarily between the two clips and see if the gauges work. Many times there is a bad connection that measures voltage fine, but won't pass enough current to operate the electronics. That's by far the most likely thing causing your issue suddenly like that.
Note that in this picture the block is rotated upside down, it's still the top fuse with the pink wire.

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Old 07-12-2018, 05:23 AM
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Thank you again, Jack!
You where right! Even if Ihad the fuse out inspecting it and even measured current through the end clips, a jumper cable between the fuse clips with the fuse removed fixed it.
This is the second time you helped me with electric trouble, last time it was the headlights.Thank you so much!
Now, how to get the clips cleaned up? I have soaked them in WD40 and scraped the inside with a small screwdriver, but no luck yet. Any tip to get them cleaned up?

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Old 07-12-2018, 08:48 AM
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Fixed it! Trying to get the currnt flowing almost made me go mad. Tried to clean with a piece of course sandpaper folded to just fit, but no result. Then tried to clean with cotton pins soaked in laquer thinner. Hope was rising when the cotton pins got dirty and then, when reinstalling the fuse fot the 40’th try, success! Everything is working properly again.
Thanks again to 65GGvert for helping me in the right direction
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Old 07-12-2018, 08:53 AM
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Originally Posted by 1965fuelie View Post
Thank you again, Rick!!!
You where right! Even if Ihad the fuse out inspecting it and even measured current through the end clips, a jumper cable between the fuse clips with the fuse removed fixed it.
This is the second time you helped me with electric trouble, last time it was the headlights.Thank you so much!
Now, how to get the clips cleaned up? I have soaked them in WD40 and scraped the inside with a small screwdriver, but no luck yet. Any tip to get them cleaned up?
It's Jack, but I'm glad you got it going. You may still have an issue with heat at the clip if you didn't get it clean enough, but now you know the problem.
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Old 07-12-2018, 09:08 AM
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You can spray the fuse clip with DeOxit and emery cloth it - but if the fingers have been weakened then its a toss up if things will stay connected electrically....

I'll probably scandalize some but I have put one of these devices in the fuse holder in such cases.....the terminals are a bit thicker (you can actually spread them even wider if necessary) and their material seems to "mate" better electrically than the glass fuse (normally I avoid such stopgap fixes but the alternative is a new fuse box/harness which is expensive and requires careful installation). These are also perfect for troubleshooting a car circuit where the fuse is continually blowing each time you change it as you're diagnosing the problem:

Amazon Amazon

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Old 07-12-2018, 09:23 AM
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Originally Posted by 65GGvert View Post
It's Jack, but I'm glad you got it going. You may still have an issue with heat at the clip if you didn't get it clean enough, but now you know the problem.
Sorry about the name confusion. Checked your profile, but my short term memory isnít functioning properly, I guess.😀
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Old 07-12-2018, 09:43 AM
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Old 07-12-2018, 12:31 PM
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Originally Posted by 1965fuelie View Post
Fixed it! Trying to get the currnt flowing almost made me go mad. Tried to clean with a piece of course sandpaper folded to just fit, but no result. Then tried to clean with cotton pins soaked in laquer thinner. Hope was rising when the cotton pins got dirty and then, when reinstalling the fuse fot the 40íth try, success! Everything is working properly again.
Thanks again to 65GGvert for helping me in the right direction
I've yet to see an electrical issue on these old cars that 65GGvert (Jack) has not been able to solve...if folks listen to his direction. Great asset here on the forum.
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Old 07-12-2018, 01:17 PM
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Originally Posted by leif.anderson93 View Post
I've yet to see an electrical issue on these old cars that 65GGvert (Jack) has not been able to solve...if folks listen to his direction. Great asset here on the forum.
Pretty much....but you have to subscribe to his logical approach. You can't go scampering all over your wiring "shotgunning" fixes.

Drives folks like him (and me) nuts...



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Old 07-13-2018, 10:40 AM
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Oouuchhhh.... here we go again. Took the 67 out to check function today, and temp gauge and backuplights worked as they should and I was happy.....until I backed up into the garage and I noticed there where no brake lights. They where there yesterday, but then...not. So... turn signals works, but no rear lights and brake lights. Front park/position lights works. Where do I check now? Another fuse problem?
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Old 07-13-2018, 11:29 AM
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Originally Posted by 1965fuelie View Post
Oouuchhhh.... here we go again. Took the 67 out to check function today, and temp gauge and backuplights worked as they should and I was happy.....until I backed up into the garage and I noticed there where no brake lights. They where there yesterday, but then...not. So... turn signals works, but no rear lights and brake lights. Front park/position lights works. Where do I check now? Another fuse problem?
Are you saying no tail lights and no brake lights, but b/u lights work now? The tail lights and brake lights are on different fuses, but use the same ground, but so do the license plate and b/u lights, so could you let me know exactly which lights are out?
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Old 07-13-2018, 11:56 AM
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Originally Posted by 65GGvert View Post
Are you saying no tail lights and no brake lights, but b/u lights work now? The tail lights and brake lights are on different fuses, but use the same ground, but so do the license plate and b/u lights, so could you let me know exactly which lights are out?
Hi again.
The turn signals functions front and rear, but no brake lights. The front park lights is there, but no rear lights. The backup lights is there now, but if I remember correctly I gave them an additional ground years ago because they where unstable.
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Old 07-13-2018, 12:06 PM
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Originally Posted by 1965fuelie View Post


Hi again.
The turn signals functions front and rear, but no brake lights. The front park lights is there, but no rear lights. The backup lights is there now, but if I remember correctly I gave them an additional ground years ago because they where unstable.

This is the car with trouble. Just took this picture in my garage when trying to solve this lightmare...😜
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Old 07-13-2018, 12:11 PM
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Does the license plate light work?
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Old 07-13-2018, 12:12 PM
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And fuel gauge?
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Old 07-13-2018, 12:25 PM
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No licence light. Fuel gauge checked by moving floater, is in function.
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Old 07-13-2018, 12:30 PM
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OK, solved it,
Should have learned from yeasterday. Jumper cable did it again. Time for cleaning up the entire fuse box.
Thanks again 65GGvert,
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