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Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 46815
Experience:  16 years experience
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e350: the dash lights are out and the 5 amp fuse in spot 36

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the dash lights are out and the 5 amp fuse in spot 36 is ok. the old switch was replaced due to the "spring" hanging out and sporadic dash lights. dash lights were working until i pulled out the spring hanging as i installed a brake controller for a trailer. not sure what to look at to find the issue keeping the dash from illuminating.

Hi, I’m Chris. Welcome and thanks for asking your question!


With the headlights on does fuse 36 have power?


Customer: replied 3 years ago.

hi chris,


no, fuse 36 is not getting any power.

With the key on are both fuses 10 and 3 under the dash good and showing power?


Customer: replied 3 years ago.

yes, both fuses (10 and 3) are getting power readings on both sides of the fuse with the key on.

Pull the headlamp switch out of the dash, and turn the headlights on with the dimmer set to full intensity. What voltage do you get at the yellow/black and light blue/red wires?


Customer: replied 3 years ago.

i am able to check with the switch in the dash...


yellow/black wire: 0


light blue/red wire: 0

Was the key on when you checked the YE/BK wire, forgot to mention it?


Customer: replied 3 years ago.

ok, retried with key on,


yellow/black: 11.97


light blue/red: 0

Thanks for doing that check, this indicates the headlamp/dimmer switch is faulty, it is getting power in but sending none out to the instrument illumination.


Customer: replied 3 years ago.

ok, that seems odd since the original switch had this problem and the new one i replaced it with today has the same issue. i also just noticed that the tail running lights are now not working (on van and trailer) and the brake and turn signal lights are working on van and trailer. those lights were working before the faulty switch was replaced earlier today.

This switch must of been damaged in the box if those wire tests were done correct, see the diagrams below.


Customer: replied 3 years ago.



i decided to check all fuses for power in the fuse box and found fuse 10 blown, which is odd because i swear it had power earlier when i checked it both sides. anyways, i replaced it and all lights are working properly now. thank you for your help, i really appreciate it.

Glad I could help, sometimes when you test things, you just have to double check them. Please take a moment to rate my response.


Chris (aka- Moose) and other Ford Specialists are ready to help you
Hello again Chris here.

It has been a few days, so I am just checking in with you to see if you still need help with the concern we worked on, and if not to say Thanks.

Also note we have about 80 categories from medical to boats to small engines to legal to whatever you can think of. If you have any other questions give us a shot with another question.

Thanks Chris