Odd problem

I've never seen anything like this....
When the headlights are pulled on the taillights come on for about 30 or 40 seconds and then go out. They won't come on again until the lights are turned off and it sets a few minutes.
This is a '79, former 4 cyl turbo (now a 302), 4 speed.
I'd like to get a taillight wiring diagram. I really don't want to get a Chiltons/Clymers as I got this car to turn for profit.
Thanks.
 
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