1988 Toyota Camry No rear/side/instrumentation lights

Electrical problem
1988 Toyota Camry 4 cyl Two Wheel Drive Automatic

Have brake, flashers, and headlights. Fuses good at guage and lights. Rear light relay tests good. When I key 'on' and turn combination sw to first position-coil side of relay base reads 12v on one side and a rapid pulsing of voltage on the other side.(Describing the two f-male relay coil-operating connections#1 at the fuses/relays block, left kickplate at driver's side). I can get all running lights IF I jumper the switch side(#3)of the running light relay but when I advance the combination sw to include turning on the headlights the headlights pulse with the same frequency I metered at the one side of the rear light relay base connector-until I close the driver's door and then the headlights cease pulsing and stay on as normal. When they pulse the head relay (underhood) can be heard cycling off at the same pulse rithym. I tried fooling the light failure sensor removing a bulb to see if there was a telltale in the dash cluster to no avail. Opened and inspected the failure sensor for burnt components, broken components-none observed-looks very good. If I plug it in all running lights work(with the jumper wire in place at the rearlight relay 'base'), and if I unplug the sensor conn. And jumper between the two greens(G=LG) then it's no rear running lights, only side marker lights. With the jumper wire in place acting as a closed swithch in place of the running light relay I get all running lights-and all the interior panel lights and the dashboard dimmer work perfectly. What's cancelling out the draw-down coil at the rear light relay and why the unusual feedback from the headlight relay when I jumper and then open the Driver's door? No measured shorts or grounds, all wires and connections seem good. Car has about 162000 mi. And otherwise runs terrific.