How do i change handlebars on a 2010 Dyna

In my limited experience the handlebar wiring usually can't be unplugged but has to be disconnected from the handlebar controls and unthreaded from the handlebar.

Hi, Jay for this scenario you will need your service manual that has all fastener torque specs -fluid capacities and a wiring diagram on the back pages, parts fiche, and owners manual if you can not find the best tool you ever bought for your Harley, despair not, for a mere zero $0 you can download another one.
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It's probably the front brake light switch is broken causing this. The brake light switch is operated by a tab on the backside of the front brake lever. To get to the switch, you must disassemble the right handlebar switch housing. Remove the two bolts that hold the housing halves together. Loosen the throttle and idle cable adjustments and remove the throttle sleeve. Lower the bottom half and you'll see the switch in the front of the housing. You'll have to unsolder the wires from the old switch and resolder them to the new switch. I don't think Harley has changed them to plug on type wire connectors. This would be my best guess.

Good Luck
Steve

Does it blow the fuses with the light on high or low beam? Has anything been added or removed from the bike prior to the fuses blowing? You definitely have a short/break in insulation somewhere. Places to look--between handlebars and frame (turning handlebars tightly may be pinching wires). Switches on handlebars, wires under tank, wires under seat

Duetch connectors are the plastic multi wire plugs. All handlebar wiring likely terminates in the headlight housing.

One the earlier models, the handlebar connectors were down under the tank. But, Harley changes electrics every year so you never know. All I can tell you is "follow the wire".