1984 Ford Mustang Stereo Wiring Information. Radio Constant 12v+Wire: Light/Green. Radio Switched 12v+Wire: Yellow/Black. Radio Ground Wire: Chassis. Radio Illumination Wire: Blue/Brown. Left Front Speaker Positive Wire (+): Green. Left Front Speaker Negative Wire (-): Black/White. 1984 Ford Mustang | Stereo Wiring Diagram Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how 1984 Ford Mustang Car Stereo Radio Wiring Diagram Whether your an expert Ford electronics installer or a novice Ford enthusiast with a 1984 Ford Mustang, a car stereo wiring diagram can save yourself a lot of time. One of the most time consuming tasks with installing an after market car stereo, car radio, car speakers, car amplifier, car navigation or any car electronics is identifying the correct color wires for a 1984 Ford Mustang. 1984 mustang wiring harness | eBay Find great deals on eBay for 1984 mustang wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. 1984 84 FORD MUSTANG DASH RADIO STEREO AMP AMPLIFIER UNIT W/ WIRE WIRING HARNESS. Pre-Owned. $50. Guaranteed by Mon, Jul. 8. or Best Offer +$14 shipping.