radio cuts off when i turn headlights on

mr2gq · Jul 27, 2011

Like it says when I turn the headlights on hte radio cuts off. I just got this car and there was no radio in it and the plug for hte radio was cut. So i just ran speaker wire to all the speakers from the new stereo and a constant 12V to the battery and the accessory I found with my multimeter that originally want to the factory radio plug. When I check with my multimeter the accessory power wire looses its power when I turn the headlights on. Also I noticed after I first hooked it up and my kids was playing in the car the stereo would turn ON when you turn on hte headlights with out the key even being in it. Now its the opposite lol so idk wtf to do or where to start looking. Im thinking a relay? Any help would be great and soprry bout the long post

5.0Pilot · Jul 27, 2011

You didnt mention where you grounded your deck. If you have a bad ground, some units will shut down when they dont receive enough voltage, your lights might be doing that. that happened to my brother's 85 and a new ground strap to the block fixed that.

Another posibility is that you could have wired the ground or switched 12v lead to the dash light lead, causing the curcuit to break whenever your lights go on.

mr2gq · Jul 27, 2011

Its grounded to the metal bracket thats bolted to the floor in the stereo din where it sits. And this 12v acc is the one that was originally in the factory stereo plug., This is a 91 gt btw

HISSIN50 · Jul 27, 2011

Why not just use a different accessory source?

mr2gq · Jul 27, 2011

Well the funny thing is my dash lights aren't working now either an as I said when my kids was playing in my car an turned the lights on the stereo turned on with out the key in. Now it the opposite. If I turn the lights on the stereo shuts off an my dash lights aren't working still either. I think it's a ground or something

mustangkarl · Jul 28, 2011

there is a dimmer ground at the radio, i accidentally used this as a ground for the radio and had the same issue. i can't remember what color it was orange and black or green and black i really can't remember.

mr2gq · Jul 28, 2011

mustangkarl said:
there is a dimmer ground at the radio, i accidentally used this as a ground for the radio and had the same issue. i can't remember what color it was orange and black or green and black i really can't remember.

The 12v acc wire im using for my stereo is orange and black. im going to try and unhook it and see if my dash lights work again. I just dont see how it would be a ground wire when it has 12v going to it with the ignition in the " ON " position. All I do know is that the 12v goes away from that wire as soon as I turn the headlights on lol. I tried adding another ground strap to the engine I had laying around. Obviously didnt change anything. Thanks for the suggestions guys

jrichker · Jul 28, 2011

Diagram courtesy of Tmoss & Stang&2birds

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