High mount brake / cargo light not working - Diesel Forum - TheDieselStop.com
2008- 2010 General Questions General questions related to 2008-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

 
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post #1 of 9 (permalink) Old 09-18-2017, 03:24 PM Thread Starter
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High mount brake / cargo light not working

Hi all. I'm new to this site. I have a 2008 f250sd. Which has the issues with the cargo light only not working. The. Brake lights work. I checked all fuses and relays and they are all good. Had to replace the light due to being burned out. Switch to an led light

I checked the voltage at the light. The brake light is getting 12 v. However the cargo is reading .002v. Pics below

I do have other issues that I am current working out. The front dome/map light is burned out and seems to work on one side only if the bulb is in the right position. Pic below both side are like this

I know the cargo light should turn on when the door is open. The key phob is used or the know next to the headlights switch is rotated fully up

Is the wiring to the cargo light tied to the dome/ map light?
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Last edited by Charger_ff; 09-18-2017 at 04:10 PM.
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post #2 of 9 (permalink) Old 09-19-2017, 06:44 PM Thread Starter
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Ok. I followed the violet wire to the sjb. I tested it and got no power from the plug sjb out. I hooked a 10 amp fuse to a wire that ran from the batter n touched the wire and the cargo light came on. Pulled the plug off and tested it from the pin holes and the lights lite up. Tested the pins where the wire connects n has no power. Also the fist 4 in a square where the violet wire is don't have power either. This is in the sjb. So I'm thinking I need a new sjb
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post #3 of 9 (permalink) Old 09-25-2017, 10:53 AM
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Don't have any of my info with me right now.

The SJB can disable an output if it goes into an over current event, Some times it can be reset and sometimes it can't. Some Code Readers will tell you if it is disabled. I believe it is a "U" code by my old memory.
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post #4 of 9 (permalink) Old 09-25-2017, 11:23 PM Thread Starter
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How can it be reset? Right now only the brake light work. Not the cargo light
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post #5 of 9 (permalink) Old 09-25-2017, 11:27 PM
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Quote:
Originally Posted by Charger_ff View Post
Right now only the brake light work. Not the cargo light
That's not surprising, as they're on different circuits.

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post #6 of 9 (permalink) Old 09-27-2017, 10:34 AM
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Quote:
Originally Posted by Charger_ff View Post
How can it be reset? Right now only the brake light work. Not the cargo light
To start, did you double check fuse F15 in the SJB. This fuse also powers the running board lights.

The Dealer can check for disable codes and reset it. I'm not sure what other code readers can read the code.


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post #7 of 9 (permalink) Old 09-27-2017, 11:13 PM Thread Starter
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Didn?t check that one. But #10 is good. I did take a fuse tester to all fuses n it showed they were all good. Will ch cl it when I get it out of the body shop
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post #8 of 9 (permalink) Old 09-28-2018, 04:06 PM
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High mount brake light wiring

I hate to bring it by your old thread but do any of you have the wiring schematic for the high mount brake light and possibly one that has the camera mounted in it? Iím trying to retrofit my 2015 super duty lariat to have the 17 high mount brake light with the camera
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post #9 of 9 (permalink) Old 03-25-2019, 08:27 AM
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It's not the brake light switch...if the regular brake lights come on when the peddle is pressed. The three lights are all fired off the same switch. Messing with that switch may cause problems for the guy that loans you his switch and for your switch. I was told that switch is a one time install. If you take it out it quits working. - this statement is unverified but may be true.

Last edited by klhansen; 03-27-2019 at 11:44 AM.
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