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The headlights turn off because you have accidently hooked the stereo's power wire onto the headlight relay wire. When you turn on the stereo, there's not enough power left to run the headlight relay. Thus, no headlights. Re-wire the stereo.

2006-08-08 18:40:37
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Q: You had installed a brand new CD in dash stereo in your 1977 corvette and now when you turn on the headlights it will knock off the stereo until you turn the headlights off again Anyone have an idea a?
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