1986 honda accord tail lights?

I have a problem with my 1986 honda accord tail lights. The brake lights work, but the running lights don't. I have checked the fuses and the bulbs and they are both good. Any ideas of what it could be?

The brake light and the tail light share the same circuit so if the brake lights are working then your vehicle has tail light wiring problem or ground problem.

You'll need to get an ETM (Electrical Troubleshooting Manual) for the vehicle because the 1986 Accord FSM (Factory Service/Repair Manual) which I have does not contain the wiring diagram for the tail lights. Strange but that the whole fact: Only the tail light diagram is omitted out of the FSM.