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Instrument panel lights not working

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Old Aug 14, 2009 | 05:55 PM
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Instrument panel lights not working

When I turn my parking lights or headlights on, my lights on the dash dont come on. The lighter doesnt work either or the radio illumination. So I checked the fuse and it is good. I used a light tester and found that I wasnt getting any power to the fuse box. For testing, I ran a hot wire to the fuse for the dash lights and everything works. So, some how the fuse box is not getting power from the headlight switch. Anyone have any idea?
 
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Old Aug 14, 2009 | 09:01 PM
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Anyone have any input? I got the dash apart right now.
 
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Old Aug 15, 2009 | 01:04 AM
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According to the wiring diagram I have, the fuses for the cigarette lighter and the hazard/stop lights are on a direct hot (yellow/black) line from the ignition switch. The light switch gets its power from a branch (black/orange) off that line, which it then directs to all of your interior lights.

First, the lighter. Do your hazard lights work? If they do, you have power on that line, which it shares with the lighter, and either the fuse for the lighter is blown, or the lighter itself is simply not functioning.


Next, the radio illumination. What kind of radio do you have? The one that was in my truck had its own illumination source, independent from the instrument lights. Whenever the radio was on, the light was on.

Finally, the instrument lights. This may be a stupid question, but have you tried turning the headlight switch **** with the lights on? It controls the brightness of the instrument lights. Barring that test, it sounds like either your switch is going bad or you have a broken wire to the fuse box. If your running lights and headlights work, then the switch itself is getting power...it just isn't being transferred to the fuse box.
 
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Old Aug 15, 2009 | 06:28 AM
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Ok. By looking at my owner's manual, it says that there is a 3 Amp fuse for "Inst. PNL." It says that this fuse controls Instrument Panel & Cluster Lamps, Ash Tray, Transmission Indicator Lamp, Radio Lamp, Heater, A/C Lamp, Headlamp & Wiper Illumination. All of the things mentioned dont work. Thats why when I put power to that fuse everything turned on and worked. The cigarette lighter worked after I did that. So I am thinking that something is cut or came unconnected somewhere.
 
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Old Aug 15, 2009 | 11:43 AM
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Originally Posted by cghstrojan08
Ok. By looking at my owner's manual, it says that there is a 3 Amp fuse for "Inst. PNL." It says that this fuse controls Instrument Panel & Cluster Lamps, Ash Tray lamp, Transmission Indicator Lamp, Radio Lamp, Heater lamp, A/C Lamp, Headlamp & Wiper Illumination. All of the things mentioned dont work. Thats why when I put power to that fuse everything turned on and worked. The cigarette lighter worked after I did that. So I am thinking that something is cut or came unconnected somewhere.
Did you try putting power to both sides of the fuse? At least on '73s the glass part of the fuse is so dang small that you can't see the wire very well. I'd put a new one in anyway to remove any questions about that, but that's just me.

Alright, pull the fuse box and check for 1. corrosion on the back and 2. loose connections at the black/yellow and blue/red wires.

If those are OK, double check the yellow wire coming from the ignition switch and see if it is loose or broken. This is the wire that provides power to both the light switch and the lighter/hazard lights.

If it's OK, pull the plug from the headlight switch and check the connections on the black/orange wire and the blue/red wire.

Post your results.
 
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Old Aug 15, 2009 | 01:15 PM
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AGW-15 .. Cigarette Lighter Fuse / .88" long / Fits: 1973/77 F100/350.

AGA-3 .. Instrument Panel Lamp Fuse / .62" long / Fits: 1973/79 F100/350.
 
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Old Aug 15, 2009 | 03:42 PM
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maybe the wire is broke or corroded inside the casing. I would use a tester and start testing the wire from the fuse all the way to the cluster.
 
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Old Aug 15, 2009 | 03:54 PM
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Well, I know it works from the fuse to the cluster. When I put a hot wire on the fuse, the lights all turned all like they were supposed to. It is somewhere between the light switch and fuse.
 
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Old Jul 13, 2010 | 07:46 PM
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Just now being able to work on the truck again. Still haven't gotten it figured out yet. I'll try pulling the fuse box tomorrow.
 
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Old Jul 29, 2010 | 08:34 PM
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Seems like a need a new headlight switch. I pulled the fuse box and it all looks good. Hooked juice up to the fuse and the lights work in the dash. So it seems like juice isn't getting from the headlight switch to the fuse box. Anyone have any suggestions?
 
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Old Jul 29, 2010 | 09:29 PM
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wow its been almost a year and your still messing with that issue. My guess would be the headlight switch, i would change that and see what happens. I dont think they cost much.
 
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Old Jul 29, 2010 | 09:42 PM
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Haha, ya its been a while. I only get to work on the truck during the summers. I'm gonna try changing it.
 
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Old Jul 29, 2010 | 11:02 PM
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I'v never changed one, but i have read in other post that their is a button on the back of the switch you have to push down to get it out. If you dont already know how to do this im sure a search will bring up a ton of stuff to help you out.
 
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Old Jul 29, 2010 | 11:10 PM
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Originally Posted by TexasTrash
I'v never changed one, but i have read in other post that their is a button on the back of the switch you have to push down to get it out. If you dont already know how to do this im sure a search will bring up a ton of stuff to help you out.
You push down on the top of the swithch`s button while pulling on the **** so you can pull out the **** and rod it is attached to out to work on the interior so you don,t break the **** when removing the gauge cluster trim piece.
It is directly above dead center of the light switch right behind the ridge you see here on the light switch.
 
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Old Jul 30, 2010 | 05:46 PM
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Hmm, I see. So I need to remove the gauge cluster then correct? Then I should see this button?
 
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