Trailer inside lights don't work

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Apr 17, 2020 | 12:19 PM

#16

Crotchety Ford truck only

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From: MA

" Running lights on" that would be trailer running lights ? If so backup and emergency work too ? If so I have never had a ("factory wired") trailer interior light w/o a switch. Is 120V inside also ?

Apr 17, 2020 | 12:20 PM

#17

minke

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From: fly-over country

Quote:

Originally Posted by SDcrewzer

Frankly, I’m not sure about what it takes to get the @#&$% “smart” trailer circuit controller to work. Assuming your truck’s trim is higher than XL, here are some things to try:
...

Is the trailer connection wiring in an XL different from the rest of the SD line?

Apr 17, 2020 | 12:47 PM

#18

78pace

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Quote:

Originally Posted by Crotchety Ford truck only

" Running lights on" that would be trailer running lights ? If so backup and emergency work too ? If so I have never had a ("factory wired") trailer interior light w/o a switch. Is 120V inside also ?

Both truck and trailer running lights. 12v on the whole trailer. It's a 30' cargo trailer

Apr 17, 2020 | 01:35 PM

#19

crewzer

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From: Mills River

Quote:

Originally Posted by minke

Is the trailer connection wiring in an XL different from the rest of the SD line?

My understanding from the Order Guide and the OM fuse chart is that SRW trucks not equipped with the trailer brake controller feature (i.e., base XL model) require a relay in power distribution box position #37 and a 30A fuse in position #27.

The optional TBC (including the “Smart Trailer Tow Connector”) is option code 52B.

HTH,
Jim / crewzer

Apr 17, 2020 | 02:00 PM

#20

minke

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From: fly-over country

Quote:

Originally Posted by SDcrewzer

Thanks for the answer. Perhaps you can elaborate more. I have a '17 XL F-350 SRW that I bought off the lot on the condition that they add the factory TBC.

1½ years later I still haven’t tested it. IIRC there was a time when the factory TBC had a connection to the brake master cylinder. I don’t know if that is still true. What I really want to know is if my “factory TBC" installed by the dealer is functionally the same as a factory TBC installed at the factory.

thanx,,,

Apr 17, 2020 | 03:42 PM

#21

crewzer

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From: Mills River

I wish I had a definitive answer, but I don’t. While I believe that the OEM TBC can be retrofitted and enabled (see YouTube videos for installing the TBC into the F150), I don’t know if that automatically includes installation and enabling of the Smart Trailer Tow Connector.

Sorry...
Jim / crewzer

Apr 17, 2020 | 05:49 PM

#22

minke

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From: fly-over country

Jim / crewzer:

Thanks. I appreciate your effort.

Apr 18, 2020 | 10:49 AM

#23

78pace

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Apr 18, 2020 | 11:13 AM

#24

78pace

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Quote:

Originally Posted by SDcrewzer

I I saw that as well and thought about it but mine has the built-in brake controller and it's a lariat drw

Apr 18, 2020 | 12:29 PM

#25

78pace

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Problem solved. Pulled every fuse for trailer system out and all looked good no blown fuse. Replaced all of them just to sure and apparently one of them was bad even though it wasn't blown. Thanks for all the help.