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1994.5 - 1997 7.3L Power Stroke Diesel  

key turn does nothing

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Old Oct 12, 2025 | 08:38 AM
  #1  
mscham's Avatar
mscham
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5th Wheeling
10 Year Member
Joined: Mar 2013
Posts: 37
Likes: 1
From: Lynnwood, WA
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Angry key turn does nothing

trying to be brief but informative
  • had no dash lights
  • took dash apart
  • replaced illum light bulbs in instrument cluster
  • put it back together
  • still no dash lights
  • more reading seemed to indicate could be caused by bad headlight switch
  • disconnect headlight switch from dash
  • pull switch out of dash
  • while attempting to remove switch from connector I can see a little movement
  • disconnect batteries
  • use screw driver to gently pry switch from connector...
  • eventually separate switch from connector
  • don't see anything wrong with connector so order replacement headlight switch
  • put everything back together
  • connect batteries
  • turn key: NADA, absolutely nothing happens
I now have a 9000 lb paper weight.
  • I don't have warning chime with key in ignition and driver door open
  • I have checked all fuses
  • I have confirmed my batteries have charge
It seems something happened while I putzed with headlight switch and its connector with power.

Thoughts on what that could be?
 
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Old Oct 13, 2025 | 06:37 AM
  #2  
tjc transport's Avatar
tjc transport
i ain't rite
Joined: Mar 2005
Posts: 65,561
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From: Marlboro Mental Hospital.
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first thing i would check is batteries and connections.
 
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Old Oct 13, 2025 | 05:03 PM
  #3  
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paddler
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Joined: Dec 2002
Posts: 664
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From: Columbia, MD
Headlight switch & circuit is separate from key switch. That NEITHER does anything means either you have a hard failure in BOTH switches or wire or connection problems common to both.

Battery connections, both positive and negative, are a good place to check.

If you have a test light or volt meter, the first thing I would check is for 12 v between several chassis ground points and battery positive. If ground/negative to batteries is bad, checking circuits for +12v to the fuse box feeds or switches without the other end being battery negative terminal will give you a false result. After confirming negative/ground is OK, then you can start checking for +12v between major positive feeds and a convenient ground.

If putzing with headlight switch "blew" all power to the truck, you should have noticed a VERY energetic event. I'm with Tom; either batteries dead or something in the big battery cables and connections are most likely.
 
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