87 Camry question about Taillights not coming On

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Hello,
I have a 87 Camry 2.0 5 speed and had a problem with the taillights not coming on when the lights are turned on. The symptom of the problem is as follows. When the lights are turned on one of the taillights will not light up and the warning light comes on in the instrument panel to let you know. However the taillights do come on when you hit the brake pedal. I fixed the problem by running a ground wire from somewhere on the frame to the taillight apparatus in the back of the taillight. Both taillights when out 1 at a time though and I fixed both by doing the same thing running a ground to the taillight that was not working and was out.

My question is this to everyone what caused the problem in the 1st place and did I fix it properly? I ask this because when I was reading the forums it said somewhere that there is a relay for the taillights located in the rear of the car somewhere did not say where though. So my thinking here is perhaps a relay in the trunk somewhere went bad causing the problem of the taillights not coming on when the headlights are turned on and I did not fix the problem correctly. Can someone please advise me as to what is the proper fix and the cause of this problem with the taillights not coming on when the headlights are turned on? Thanks for you help in this matter as I am sure someone on here has gone through this problem and must know the correct answer please advise.
Dave
 
Take a look in the trunk where the light bulbs plug in. The plastic "box" that the sockets twist into have a separate ground wire attached to the box. Make sure this ground wire is secure.

I had a problem with the "lights" warning light coming on even after verifying the bulbs were good. I found this ground wire loose on one of the boxes.

There is a sensor of sorts somewhere in the trunk. I've read that this sensor has a habit of going bad.
 
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