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Brake light & parking light wiring problm

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Brake light & parking light wiring problm

  #1  
Old 04-19-2019, 08:44 PM
Doug Pannebaker
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Default Brake light & parking light wiring problm

On my 91.5 W250 Cummins I have a issue. When I apply the brakes the rear brake lights work fine however the parking lights up front will slightly glow as well. Any ideas what might be the problem.
I have cleaned & or replaced grounds, pulled the fuse box to see if are any wires touching, removed the pig tail on the firewall where all the main wiring goes. Replaced the multi switch (turn signal lever housing). All looks good there too. Found nothing wrong under the dash as well. Are there any relays in line from the brake light switch that may cause this problem? Iíve been dealing with this problem for a couple of years & found nothing out.
 
  #2  
Old 04-19-2019, 09:13 PM
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The brake lights are back-feeding into the parking lights circuit. Likely happening at the bulbs, or sockets in back.
 
  #3  
Old 04-19-2019, 09:31 PM
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did you check to make sure the brake light sockets are grounded? i have usually found the ground wires fail where the 2 light socket wires connect behind the tail light.
 
  #4  
Old 04-20-2019, 06:20 AM
Doug Pannebaker
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Originally Posted by HeyYou View Post
The brake lights are back-feeding into the parking lights circuit. Likely happening at the bulbs, or sockets in back.
yes. I replaced both sides rear & right front maker lamp socket. Iíll go back over all rear bulb sockets.
thank you for your help. If you come up with anything else that may be the problem please contact me.
Doug
 
  #5  
Old 04-20-2019, 06:23 AM
Doug Pannebaker
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Originally Posted by crazzywolfie View Post
did you check to make sure the brake light sockets are grounded? i have usually found the ground wires fail where the 2 light socket wires connect behind the tail light.
i have, but iíll Go back over them to make sure. I replaced both brake/signal sockets with new ones from NAPA.
If you think of anything else please contact me.
thank you for your help.
doug
 
  #6  
Old 04-20-2019, 08:57 AM
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are you 100% sure you got the new ones wired right? it sounds like some wires may have got mixed up.
 
  #7  
Old 04-20-2019, 12:29 PM
Doug Pannebaker
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Originally Posted by crazzywolfie View Post
are you 100% sure you got the new ones wired right? it sounds like some wires may have got mixed up.
yesa, I am 100% sure. I was having this issue with the old sockets. Passenger side rear didnít light up at all so I tested it no power got new sockets put them in the same way with the correct wire going to where it belonged. That issue of no passenger signal a wire was it & taped off. Not sure who done that the only people would have been the installer for the wiring for my hauler.
Thanks for the feedback.
Doug
 

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