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speedo and LCD intermittent

 
  #1  
Old 01-11-2019, 09:37 AM
supermanotorious
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Default speedo and LCD intermittent

Just a day ago I noticed the speedo and LCD were not working, the needle stayed at zero, the LCD blank, but then they'd both flicker at low speed while hitting some bumps, now if it comes on at all, it's while stopped, now I did clean the sensor at the transmission cover and that did not fix it, the trim ring to the bezel is lit up so I'm getting power there, any ideas? I will say the needle and LCD are either working or not in tandem
 
  #2  
Old 01-11-2019, 11:56 AM
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Start at the connections at the back of the speedo and work your way from there. Look for anything loose, pinched or worn. Also check your battery cables at the battery terminals and ground.
 
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Old 01-11-2019, 12:12 PM
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Word, checked the connection at back of speedo, looks ok
 

Last edited by supermanotorious; 01-11-2019 at 12:15 PM.
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Old 01-11-2019, 12:47 PM
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Check the under-seat connections too... I know the tach connects under there, and the speedo probably does as well. Also check the speed sensor connection on top of the tranny. I'm not sure that would cause this behavior, but it makes sense to me.
 
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Old 01-11-2019, 06:49 PM
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Iíll tinker with it tonight but one observation from my ride home from work is that it goes out when the RPMs climb, not to do w speed. If in neutral and I rev it flickers out, maybe someone knows more?
 
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Old 01-12-2019, 10:20 AM
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I checked all the plugs and did not see anything obvious. Could the unit itself be going bad? Here is a video demonstration.

 
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Old 01-18-2019, 01:14 PM
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A smoking battery told me to check the charging voltage! I believe a bad voltage regulator could be to blame for the speedo malfunction
 

Last edited by supermanotorious; 01-18-2019 at 01:15 PM.
  #8  
Old 01-19-2019, 03:25 PM
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I pulled the voltage regulator and sure enough it's been seeping some fluid. Meanwhile I ordered a new one from Dennis Kirk and charged and load tested the smokey battery, appears to be in good shape luckily. I decided to pull the tank for routing the new regulator wire and fixed some engine mount bolts that have been seized for years.

 
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Old 01-25-2019, 03:18 PM
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yup, new voltage regulator resolved the speedo issue!
 
  #10  
Old 01-25-2019, 04:30 PM
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I just love happy endings!!
 
 


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