How to adjust auxiliary lights on 2010 HD heritage softail. Cannot find any way to make adjustments.

Yes they do and of course trailers as well.

Black Harley Softail Hitch: 1984 to 2017 - US Hitch

https://www.ushitch.com > Harley > Softail FLST

Fits the Heritage Softail Classic and Deluxe from 1984 to 2017. Also fits the Fatboy prior to 2007. Includes hardware, removable tow bar and 1 7/8? ball.
US$269.00 · ‎In stock

https://www.google.com/search?q=2007+hd+heritage+softail+trailer+hitch

..

Duplicate question already answered

Gidday Bill, Have a good look at this link and hopefully you will get the answers you need. They are apparently a wee bit of a bummer as far as colour coding goes.
https://www.scribd.com/.../1997-1998-Harley-Davidson-Softail-Service-...

Mar 27, 2010 - 1998 Sottail Wiring Diagrams . ... Headlight, taillight and turn signaloperation. ...... HD-4.2465 Transmission Pawl Adjuster - Heritage Springer Models (FLSTS) ..... It the positive cable should contact ground with the negative cable ...... If tire has colored dot on sidewall, it is a balance mark and should be ...
Hope that helps you out Bill.

Change all fluids. Adjust clutch. Check spark plugs. Adjust primary chain. Lube cables. Check air pressures. Check all lights. Adjust throttle cables. Check spoke tightness. Check fall away (neck bearings). Check rear belt tension. Tighten critical fasteners. Check proper operation of all controls.

Usually it takes as special tool to hold the lights while you tighten the screw. You have to take the turn signal off and adjust the light then put the turn signals back on.

Steve