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I have high beams but no low beams. I have the same problem…

Customer Question
I have high beams...

I have high beams but no low beams.

Mechanic's Assistant: Have you checked the bulbs and fuses?

I have the same problem when I hook up my plow

Mechanic's Assistant: What is the model/year of your Ford?

2008 F250

Mechanic's Assistant: Are you fixing your F250 yourself? What have you tried so far?

I'm trying to fix it myself.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Fuses seem fine

Submitted: 4 months ago.Category: Ford
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Answered in 11 minutes by:
3/29/2018
Ford Mechanic: Dan, Technician replied 4 months ago
Dan
Dan, Technician
Category: Ford
Satisfied Customers: 26,029
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Verified

Hello, my name is ***** ***** I'm here to help get your problem solved.

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Customer reply replied 4 months ago
Ok.
Ford Mechanic: Dan, Technician replied 4 months ago

It sounds like your smart junction box which is interior fuse box has failed. The headlight switch sends signal to the smart junction box and smart junction box sends power to the bulbs. Since high beams work we know the headlight switch is working, only other option would be both bulbs happen to be burned out or two different wires happen to be damaged which is unlikely. My goal is to provide 5 star service so please let me know if you have any questions, thanks.

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Customer reply replied 4 months ago
Where is the smart Junction Box located?
Ford Mechanic: Dan, Technician replied 4 months ago

Here is a picture, let me know if you have questions. Thanks.

-

https://www.dropbox.com/s/dtu0xivrk9e5y85/sjb.pdf?dl=0

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Customer reply replied 4 months ago
I have power at fuses 7 and 8
Ford Mechanic: Dan, Technician replied 4 months ago

That doesn't mean much because the fuse powers a diode in smart junction box which then allows power to go to bulbs so this would just be more proof that the smart junction box is problem. Here is a wiring diagram so you can see how it works. Let me know if you have questions, thanks.

-

https://www.dropbox.com/s/neens5f4t1ek70b/wds.pdf?dl=0

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Customer reply replied 4 months ago
I'm reading a lot of forums online that claim The boss plow hook up is responsible for this issue. Do you happen to know If this is true?
Ford Mechanic: Dan, Technician replied 4 months ago

Transistor, not diode but the terminology mixup doesn't change anything else. That is very possible, I've seen them cause random lighting problems and it may have even burned out the smart junction box so I'd recommend unplugging everything electrical related to plow to see if that helps before replacing the smart junction box. Let me know i you have questions. Thanks.

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