Fuse Blows!

I would pull the TS flasher, and take a look at your backup harness path. Either auto or stick, will have a harness down the firewall, over the transmission hump, and with auto, connect to the 3 pin neutral safety/ backup switch, and with a stick just connects to the 2 pin reverse switch on the transmission

If that gets you nowhere, "I guess" pull the connector off the heater/ AC controls. But the short MIGHT be some odd thing in the harness before "it gets" to any of that.

How about radio? Pull that connector FOR SURE especially if it is aftermarket