PARKING LIGHT UPGRADE FAILED - BLOWN 15 AMP FUSE: WHERE TO TROUBLESHOOT FIRST WITHOUT REMOVING STEERING COLUMN COVER

The dashboard instrument lights, parking lights and tail lights on my 72 240z were shut down when I turned  the combo switch on. I noticed that the 15 amp fuse inside the fuse holder in the Parking light harness kit went south. Replaced it with another 15 amp and keeps blowing the fuse? I really don’t use this car that much just on Sundays for an hour or two.

https://www.datsun-240z-upgrades.net/product-info/

 How would you approach the repair systematically without removing the steering wheel column cover to access the female and male 6 wire connectors? Where would you check first?

Looking to hearing from you shortly.

Regards,