Its the switch mounted to the left of the column just next to the headlight switch. I can't remember replacing that wire but that's not to say I didn't I will check it out tomorrow. Thank you my dad bought that truck new in late 1969. And I put the 20 inch wheels and painted it it came stock with a 360 since 1995 I've had a 390 and about 8 years ago I built the 428 for it and just never drove it due to having a newer truck I sold the new one and want to drive this one