the best bet would be to check the website for the manufacturer of the radio.... but USUALLY the orange is constant (fused battery), then there should be another (usually red or red with a srtipe in my experience) that goes to an ignition hot.
every aftermarket radio I've dealt with so far uses the yellow as a trigger wire to switch a power antenna or external amplifier.
try this... with the radio power off, put a multimeter on that yellow coming off the radio... I'm thinking it should be 0v. then turn the radio on, it should be ~12v
Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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