Question about 1997 Ford F150 Regular Cab

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I have a 1997 Ford F150 4x4 Supercab Stepside with 5.4L and factory towing package. On the factory trailer wiring plug I am not getting power for turn signals or brake lights. Running lights and brake controller work fine. I have checked fuses, and one was blown, which I replaced to get running lights working. But I still do not have brake or turn signals at the plug. Is there something else I can check before tracing the lines?

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  • alcruiser07 Dec 11, 2009

    Thanks - the ground in the connection is good.

  • alcruiser07 Dec 11, 2009

    Thanks - that's what I was thinking - but hoping there was something else to check. It's been sub-freezing here with plenty of snow on the ground, so I don't relish the thought of laying on frozen ground trying to trace wires under the truck!

  • alcruiser07 Dec 11, 2009

    That's a good idea, Mike - I haven't completely checked it that way. I'll try that tomorrow when it's warmer and sunny and let you know!

  • alcruiser07 Dec 14, 2009

    Thank you for the excellent diagrams! It WAS the fuse in that secondary min-fuse panel that was blown - I didn't even know it was there until I was re-reading the owners manual and saw those extra fuses yesterday. That took care of the problem - I now have all trailer functions working correctly.

    Thanks to everyone for their suggestions!

    Al

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No, check the wiring in the rear going to hitch plug, they may have rotted or broke,if lights work on the truck then i would say its wiring,test wiring moving backward until you get power, this way you can pinpoint break location area, good luck, hope this helps.

Posted on Dec 11, 2009

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It is a possible option that the relays for the Stop / Turn are having an issue or the fuse in the Engine Mini panel is blown ( page 142 of the 1997 owners manual )

On the 1997/98 MY this is in the aux relay box in between the Engine Compartment fuse panel and the engine mini fuse panel.
I have a 1997 Ford F150 4x4 Supercab Stepside with - 9349aa0.jpg

The output of the MFS ( Multifunction switch ) triggers the relays, to use the trailer tow fuse to operate the trailer lamps. The fuse to supply power to the Normally Open contacts on the trailer relays should be hot at all times. You can verify this with the diagram below by metering from pin #3 to pin # 2 [ground for coil] or to another known ground.

These are 1/2 size Ford ISO relays, and can be jumpered to make testing easier ( and with this diagram you can bench test them with a meter to check resistance over the Normally Open contacts, when applying power and ground to the coil ).
3a3e4ca.jpg

I am not 100% sure on the 97/98 MY F-150 about the location of this connector, but the 99-03 have all the wires to the rear of the truck via a connector along the driver's side frame rail, that you can check I have a 1997 Ford F150 4x4 Supercab Stepside with - 777e616.jpgst with the spare lowered )
777e616.jpg

Start with the Fuse in the Engine Mini panel, to see if the 20A fuse is good and work back towards the trailer tow adapter via the relays. I am going with the obvious blown fuse for the Stop/Turn lamps for the trailer.

Posted on Dec 14, 2009

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  • Master
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Hi Al,

Click here for a list of the various types of trailer plugs and the standard functions of their respective pin outs. Depending on the type of trailer the package was designed for, the pin configurations do differ. It's possible that this is the case here.

My first suggestion is

  • Get a test light or volt meter
  • have someone hold their foot on the brake,
  • at the plug, check for power on ALL the pins.
  • If one of them does light up, make a note of its position
  • Repeat the process for the turn signals
Best regards
Mike


Posted on Dec 11, 2009

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  • Expert
  • 38 Answers

Yes, check the grounding both on the trailer and truck wiring harness that leads to the trailer. Sometimes the ground wire can be corroded from being exposed to the outside elements. Hopefully this helps.

Posted on Dec 11, 2009

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Posted on Jan 02, 2017

tunde007
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SOURCE: 1997 f150 supercab 4x4 4.6

Hi, it is usually under the dash, just above your right leg, and connecting the wires from the brake controller to the wiring harness, and then plugging the harness into the harness located under the dash.

Posted on Oct 16, 2010

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Not sure which fuse you checked.
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4418e16.jpg

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c2f0bcb.jpg

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There are a few fuses for the trailer tow adapter.

1st, is theodd location on the 97-98, engine mini fuse panel has a 20 A fuse forthe stop / turn lamps. Have seen it covered in tape from the factory onsome 97-98 MY trucks.
This is on page 142 in the owners 1997 manual, all the revisions for the 1998 owners manual I have seen do not include this fuse box for some reason.

Download a PDF version from Ford, for the 1997 MY at :

https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

This is a picture of the Power Distribution Box, additional relay box and engine mini fuse panel with the covers off. The 20A in the upper right panel with the red base, is the trailer stop/turn fuse.
3b8aa6c.jpg

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