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Headlight low beam n/w

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Old Jun 19, 2021 | 04:02 PM
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2018f250stx's Avatar
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From: Norwalk ohio
Headlight low beam n/w

My passenger side upper low beam is out , replaced bulb still does the same thing no low only high beam. Checked wiring I don't see any damage. Look in manual nothing listened for fuses for headlights . Anyone have a wiring diagram? I can't find one online.
 
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Old Jun 19, 2021 | 05:12 PM
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Have you checked voltage with a DVOM?
And, it's not unheard of to get a new bulb that is bad.
 
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Old Jun 19, 2021 | 05:16 PM
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Check for a bad ground connection, from the socket ground wire to the chassis. And while your at the socket, confirm it does not have power on the low beam circuit, if it does then you have a bad bulb.
 
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Old Jun 19, 2021 | 05:26 PM
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Are you receiving a bulb outage message? Have you made any forscan changes?
 
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Old Jun 19, 2021 | 06:17 PM
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From: Lost in the Ozone....
Originally Posted by jimzpsd
Check for a bad ground connection, from the socket ground wire to the chassis. And while your at the socket, confirm it does not have power on the low beam circuit, if it does then you have a bad bulb.
Bad ground would affect both hi and low beam as the bulb shares the same ground for hi/low.
 
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Old Jun 19, 2021 | 06:22 PM
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From: Lost in the Ozone....
Originally Posted by 2018f250stx
Anyone have a wiring diagram?
Here ya go....
.


 
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Old Jun 19, 2021 | 07:30 PM
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From: Norwalk ohio
Originally Posted by h20camper
Here ya go....
.
thanks , ill have to find a few hours to start tracing it, I was hoping it was going to be a fuse but that's not the case
 
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Old Jun 19, 2021 | 07:34 PM
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From: Norwalk ohio
Originally Posted by jimzpsd
Check for a bad ground connection, from the socket ground wire to the chassis. And while your at the socket, confirm it does not have power on the low beam circuit, if it does then you have a bad bulb.
the high beam is working it uses the same ground as the low beam,,, I did try other bulbs
 
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Old Jun 19, 2021 | 08:10 PM
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Originally Posted by h20camper
Bad ground would affect both hi and low beam as the bulb shares the same ground for hi/low.
Your right,............thank you for the correction
 
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Old Jun 20, 2021 | 06:32 AM
  #10  
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From: Norwalk ohio
I've got a bad feeling it's the bcm, hope it's covered under warranty

 
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Old Jun 26, 2021 | 09:45 PM
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Found it, Dang chipmunk chewed the wire


 
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