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1994.5 - 1997 7.3L Power Stroke Diesel  

shifting issues after headunit install

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Old Aug 11, 2012 | 07:37 AM
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rat49f6
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shifting issues after headunit install

i installed a headunit into the truck tonight and on the drive home the speedo was dead, the trans shifted like **** and the OD light was flashing

what could i have messed up?
the only thing touched was took th head unit out and removed the speedo bezel to reach behind the headunit to move wires around
 
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Old Aug 11, 2012 | 09:28 AM
  #2  
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Mark Kovalsky
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There is a module on the back of the speedo that sends vehicle speed info to the PCM to control the transmission. You did something to interrupt that signal.
 
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Old Aug 11, 2012 | 09:40 AM
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rat49f6
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Thank you mark
Your wealth of knowledge is a great benefit to this community
 
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