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Blown fuse

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Old Jun 12, 2019 | 05:03 PM
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Default Blown fuse

I have an issue with the panel lamps on our 66. I am almost done with a body off restoration. All wiring was replaced (lectric limited harnesses) everything is fine accept the panel lamps don’t work. Keeps blowing the fuse. Electrical is not my strong suit. Any advice, suggestions would be greatly appreciated. Mark
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Old Jun 12, 2019 | 05:16 PM
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double check and make sure you have the correct amp fuse.
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Old Jun 12, 2019 | 05:23 PM
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I own a C1..........but have you checked your light/dimmer switch and ground?
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Old Jun 12, 2019 | 07:38 PM
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You need to buy an ohmmeter!
With that you can look for a short between the metal chassis and the panel lamp wiring.
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Old Jun 13, 2019 | 10:55 AM
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What size fuse is blowing? What bulbs do you have in the panel sockets? The only thing that should be fed by the inst panel fuse is the circuit with the gray wires. The dash lights and the radio light. Aftermarket radio? If the tail lamp fuse blows (second from bottom) you won't get power on the inst lamp fuse. Which fuse is blowing, the tail or inst lamp fuse (third from bottom)?

Last edited by 65GGvert; Jun 13, 2019 at 11:00 AM.
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Old Jun 13, 2019 | 05:12 PM
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It’s the instrument panel 4amp. Got into it today. Discovered (by accident) that the side of the fuse block that goes to all the dash lights (fuse out) is grounding to the instrument cluster(the other side of the fuse holder is the dark green wire that goes to the light switch) I am pretty sure its not supposed to ground to the cluster. I do have an aftermarket radio (antique automobile radio)
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Old Jun 13, 2019 | 05:18 PM
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The bulbs are 1816 transferred from old harness. Like I said originally everything else works running lights brake lights headlights blinkers interior radio
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Old Jun 13, 2019 | 06:05 PM
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Everything else is stock or oem replaced
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Old Jun 13, 2019 | 08:02 PM
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Originally Posted by Jaycobsladder
It’s the instrument panel 4amp. Got into it today. Discovered (by accident) that the side of the fuse block that goes to all the dash lights (fuse out) is grounding to the instrument cluster(the other side of the fuse holder is the dark green wire that goes to the light switch) I am pretty sure its not supposed to ground to the cluster. I do have an aftermarket radio (antique automobile radio)
I'll take a shot. The green wire goes to the left side of the fuse (as you look under the dash) and the gray wire comes out and splits into all the panel lights including the radio. If you are reading a short with a meter, that would be normal because of all the bulb filaments low resistance to ground. I'd do two things, first make sure where the gray wire originally for the radio is now. The aftermarket probably doesn't need one. Make sure it's not shorted. Second, I'd try a 5 amp fuse. 4amps is very close to what the bulbs will draw and it may be blowing because it's just over the edge. You could have a short on the gray wire anywhere behind the cluster. If you're saying you have a physical short on right side of the fuse box, that's not right, it should only connect to the gray wire and nothing else on the right side of the fuse.

Last edited by 65GGvert; Jun 13, 2019 at 08:15 PM.
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Old Jun 13, 2019 | 08:22 PM
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Old Jun 14, 2019 | 05:12 PM
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Okay, I took the gauge cluster out and the driver side panel. Plugged the headlight switch in and grounded it. Put a new fuse in and used a wire to ground to test each socket/bulb. Hooked the battery up, made sure none of the sockets were grounding and turned the switch on. The lights for the radio and the clock came on! Then I touched the outside of each socket with the grounded wire. One of them blew the fuse. The contact on the inside was bent over touching the socket. Checked the rest all good. Problem solved. Everything works now. Thanks to all of you who responded. Can’t wait to get it back on the road, almost there! Mark
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