Question about Harley Davidson FLHTCUI Electra Glide Ultra Classic Motorcycles

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1997 HD TLE Sidecar to 2008 FLHTCU wiring harness (lights)

I have a 1997 HD TLE Sidecar that I am hooking up to a 2008 Harley FLHTCU. I have all the correct brackets etc but I I cannot find where I connect the wiring harness from the sidecar to the bike to connect the lights.
Unfortunately I do not have a sidecar service manual and my bike service manual does not list the connection.

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  • imac380622 May 21, 2009

    The sidecar has a 4 prong female plug and there is a 4 prong female plug under the seat of my bike. I guess Harley sells an adapter to connect the two female plugs?
    Thanks for the info. Hopefully it works with my rig.

  • imac380622 May 21, 2009

    I'll have a closer look for another plug. The one I found was colour coded orange with yellow stripe,solid black,red with orange stripe,solid red. There was also another blank plug under the seat with a single red wire to a grey female plug.
    Thanks again for you time and help

  • imac380622 May 26, 2009

    Thanks for the info.. I have checked under both sidecovers and under the battery box etc had have been unable to find any other open(empty) plug other than the one I have describe above. The Shop Manual describes it as an accessory plug but does not say for what accessories. I suppose I'll have to splurge and fork out the $100 to get a sidecar manual to fill in the blanks. I can't seem to find a website where I can download the manual. Thanks for all your help!!

  • Alessandro Falsina
    Alessandro Falsina Oct 22, 2015

    I've the opposite situation, I've a 1997 FLHTCUi to be connected at 2001 TLE Ultra. Why we don't exchange the electrical wire system of the sidecar?



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Does the sidecar harness have a square 4 pin plug? If it does it more than likely connects to the auxillary plug under the seat.

Posted on May 20, 2009

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  • hardan May 21, 2009

    There should be two 4 pin square plugs, 1 is the data link and the other is the auxillary plug.

  • hardan May 21, 2009

    The first one you mentioned is the data plug. The Auxillary plug will have a red, blue, orange, and black I believe. You might check under the side covers also...Iknow some of the stuff is moved around on the newer models.

  • hardan May 21, 2009

    I will look tomorrow when I get to work if I don't forget.


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Hi Anonymous, for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix/test or parts inquiry. If necessary transport your vehicle to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your issue. For more information about your issue please visit the website below. Good luck and have a nice day. 1990 1997 HARLEY DAVIDSON SIDECAR MODEL SERVICE MANUAL

Posted on Oct 23, 2015


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