Question about 1997 Mercury Mountaineer

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Radio shuts off when I turn the lights off

Why is it when I turn my headlights or turn the interior lights off my radio turns off?? How do I fix this??

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  • t_ratkowiak Dec 18, 2008

    When the lights are turned off the radio shuts off completely and then when the lights are turned back on the radio is able to turn on but has reset its elf, how do I fix this. It is the factory stereo that is doing this.



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Does it actually turn off... or do the lites just go off... is that an aftermarket radio... it sounds like they have used the power wire that puts power to the display onto the power wire for running the radio.


Posted on Dec 18, 2008


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After dark I get no sound out of my speakers. Any other time of day it works great.

I take it you mean that the radio stops working completely once the headlights are switched on. So if you sit in the car during daylight hours and turn the lights off and on, the radio does the same except the other way round (lights off, radio on). Have I got that right?
It cannot be the fuse because the radio wouldn't work at all if it had blown. The wiring may well be the problem. Something is either shorting or I am thinking that there is not enough power (for whatever reason) to run both lights and radio at the same time, although the battery draw on a radio is relatively low. Is your battery charging correctly? Does it happen if you open all doors and the interior lights operate. Try opening all the doors and turning headlights off and on. Do the interior lights turn off and on like the radio does?

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I love gremlins. ok first thing first. the headlights, you will see a fuse box in the engine compartment near the battery. remove the cover and you will find fuses and relays. if there is no label showing you which is which (look under the lid you just took off), feel them. the one very very hot is the one that controls the headlights (if they are stuck on a the time you do that.) replace that. it should sort out your headlight issue and possibly the interior lights.
now on to the interior lights. you haven't mentioned a blown fuse, i presume you did check them. same thing. check all the relays for one that is very hot, your door would be open anyways so the interior lights will be on at the time. replace that relay.
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I've never seen the lights on the radio not dim when the headlamp switch is turned on. hm.

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