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94 f150 speedometer question

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Old May 13, 2012 | 08:32 AM
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94 f150 speedometer question

I got in the truck yesterday and the speedo didn't work, or the odometer. The dome light was not working and the overdrive light is flashing on the shifter. Fuse problem? any ideas? I was checking fuses but they looked ok, it has to be a fuse. we had alot of rain for a few days.
 
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Old May 13, 2012 | 10:21 AM
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https://www.ford-trucks.com/forums/1...-question.html Have a look at the circuit diagram in this thread.
 
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Old May 13, 2012 | 11:47 AM
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I had the same problem with a 94 F250 4x4 460 AT. It was a blown maxi fuse in the under hood fuse box. It happened again and I found a bare wire coming out of that box. I happened when it was raining/muddy. I fixed the wire and have had no problems since.
 
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Old May 15, 2012 | 04:18 AM
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Thanks. I'll let you know when I get some time off to check
 
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Old May 15, 2012 | 10:43 AM
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I just posted a thread on this today! I have the SAME EXACT symptoms. First thing suggest was to replace the VSS. So I'm picking that up tonight and I'll let you know if that fixes it. Slow steps. I'm making sure I take care of the easy stuff before tackle something behind the dashboard. My dome light isn't working either. WE have the same exact thing going on. Here's my thread posted 5 minutes ago.

https://www.ford-trucks.com/forums/1...-of-stuff.html
 
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Old May 18, 2012 | 01:48 AM
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Glad to hear it's working now. I'll check #8 fuse. where is the VSS located.
 
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Old May 18, 2012 | 01:47 PM
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VSS is on top of the rear axle differential housing.
 
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Old May 18, 2012 | 01:49 PM
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Originally Posted by davido
Glad to hear it's working now. I'll check #8 fuse. where is the VSS located.
Oh mine, its on the rear differential. Just a quick turn with a 1/2" socket took it out.
Autozone guy said it was on the catalog as an ABS speed sensor. It should look like have a 90 degree bend to it.

Fixed the O/D light. Which fixed the shifting. Truck actually shifts gears now and I don't have to fill up the tank every couple of days

The #8 fused fixed a lot of problems for me. Buzzer, light that turns on when I open the door, odometer/speedo.
 
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Old May 19, 2012 | 03:13 PM
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Fixed now. It was the #8 fuse and I also changed the speed sensor on the rear end. Had the codes pulled and they said it was the speed sensor and it needs the o2 sensor replaced.
 
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Old May 20, 2012 | 02:58 PM
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Originally Posted by davido
Fixed now. It was the #8 fuse and I also changed the speed sensor on the rear end. Had the codes pulled and they said it was the speed sensor and it needs the o2 sensor replaced.
Oh, where's the 02 sensor?
 
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Old May 21, 2012 | 01:15 AM
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It should be before the cat. I'll order it from Rockauto.com
 
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Old May 21, 2012 | 08:43 AM
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Originally Posted by davido
It should be before the cat. I'll order it from Rockauto.com
Follow up on how hard/easy this was. I don't mind replacing a bunch of stuff on my truck because who knows when anything was replaced. Original owner didn't even know when he changed the oil and he had the car for 2 years.
 
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