2009 1100 Vstar headlight and taillight continues to blow fuse 15amp Checked wiring, replaced wiring harness and it still blew. I'm about to take it to the shop. Any suggestions.

fuses blow because of dead shorts or excess current draw
to blow a 15 amp fuse indicates a dead short
by disconnecting the rear lights , the problem is in something else you have replaced
could be a problem in the head light wiring

GOOD ADVISE--I ALSO LEARNED THAT THERE MAY BE FUSES IN UNDER THE HOOD ALSO. FOUND OUT TODAY THAT IF THE DOME LIGHT DON'T WORK THEN IT'S FUSE COULD BE BLOWN AND HINDER THE CIRCUIT TOO. I'M NOT GOOD ON VOLTAGE READING , BUT DO HAVE A TEST LIGHT. IF NO FIRE AT THE COMMON TAIL LIGT-DASH LIGHT FUSE , THEN THAT MIGHT NARROW IT DOWN. I HAD THE SAME TROUBLE IN MY 1990 FORD XLT LARIAT AND WAS BLOWING THE TAILLIGHT FUSE. IT WAS A SHORT IN THE EXTERNAL TRAILER KIT HARNESS WHICH CAUSED FUSES TO BLOW REGUARLY. WHERE IS RELAY FOR TAILIGHTS AND OTHER FUSES UNDER THE HOOD??

Take rear lamps out of their sockets and turn on power if fuse still blows more than likely its a wire. Did you check the TAG LIGHTS, and side marker lights?

Disconnect harness under dash, remove bulbs in taillight, use a meter to go from hot to ground, look for a short.

You should fix the real problem first. Look at your trailer wiring harness, make sure it isn't shorting. Your problem could also be caused by the headlight switch. Try jiggling messing with it to see if your dash lights flicker.
The trailer wiring harness would have blown the fuse, which is probably a 20A in the second row. The headlight switch wouldn't be blowing any fuses, which would probably explain your trouble in finding it.

It sounds like you definitely have a short. Get an ohm meter and probe the power wire to each light. One of them should register continuity to ground. This will give you a starting point for where to start looking at the harness.

you have a shorted out circuit in the wiring, check harnesses for worn spots and run tests from light switch to taillights, detective work

Yes, the timing of the start of the problem indicates it's something that happened then. It could be a wire on the assembly was pinched or covering damaged by a screw holding it in place. How quickly did it blow the 1st replaced fuse? Let me know how u make out.

I would remove the dome light, and disconnect the wiring connector, and then put in another fuse. If it does not blow, I would think that the dome light switch is shorted to ground.

disconnect head lights, and replace fuse. Then turn the light back on to see if it blow a fuse again. if not, plug on light in at a time. You might have a bad headlight???? then unplug that one if nothing happens. Then plug the other one in. It could also be a bad taillight bulb. I have had bad tail light bulbs. Do all of them, one at a time.