Wiring harnesses for classic Chevy trucks and GMC trucks Wiring harnesses, wiring harness clips, and obsolete parts for classic Chevy trucks and GMC trucks from Classic Parts of America. 1947 1948 1949 Chevrolet Truck Wiring Harness 6 or 12 Volt This is very nice and well made wiring harness for the 1947-1949 Chevrolet trucks. This is a stock OEM type of wiring harness for 6 volt or 12 volt systems using the original type generators and voltage regulators. This is set up for the 6 cylinder models.Seller Rating: 100.0% positiveLocation: San Clemente, California Chevy Wiring Harness Kit, Power Plus 13, 1949-1954 Eckler's Early Chevy wants to point you in the right direction. With a Power Plus wiring harness update kit, you will get everything you need. This wiring harness kit will complete the updated wiring in your entire Chevy, including an ATO fuse panel with the necessary fuses.