2003 dyna superglide-riding along all power failure,motor died,battery super hot.does not attempt to turn over[like no fire] headlight works on low,horn works,signal nor starter switch work.replaced r

SOURCE: '06 Harley Davidson FXDI35 Speedometer and Accessories Don't Work

Check for coroson on all the conectors.

SOURCE: blowing fuses,battery too hot

Sounds like the voltage regulator is not working properly.

SOURCE: accessory fuse keeps blowing, headlight not working

I know this sounds aomewhat general, however please give the following some thought:
Check your relays, if you have an aftermarket horn you may have a different relay. To troubleshoot unplug your headlight, unplug your horn, etc.. Turn your ignition switch to accessory only. See if the fuse pops. If it does unplug whatever added accessories you may have still have plugged in. Once you can get the fuse to stop popping, turn the ignition switch to on. Then one at a time plug you accessory, headlight, etc. back in. When you find what pops the fuse, unplug that item, start plugging in the other items, if the fuse has not popped you have potentially isolated the circuit causing the issue. Now check the wiring for loose connections, bad ground, and CHECK the relay if that item has one. Hope this helps,

JP

SOURCE: how to change oil in 2003 HD FXD Dyna Super Glide

remove the drain plug from the oil pan, you will need either a 3/4" box wrench or a 5/8" box wrench and the drain plug will be facing forward on the the oil pan. It is easiest to remove this drain plug from under the right side of the bike. put drain plug back in after about 10 m,inutes of drain time and tighten to 18 ft. lbs. Dont forget to change the oil filter as well.

SOURCE: Engine Light Going On/Off

yes it could cause this
fully charge battery and try again