My normally very reliable and mild-mannered 85 QV is mad at me. I was out of town for a few months, and in my absence, her headlights started malfunctioning. First, they wouldn't turn on, (but went up) and then, they starting cycling up and down continuously. I've been a little busy since all this trouble started, so I only got to working on it today. Over a beer or two, my friend and I went through a number of trouble-shooting steps, as described below, with no luck, and have come to the rather baffling conclusion that both motors have a bad diode. I am never comfortable with the idea of simultaneous bilateral failures without an apparent common cause, so I will describe our methods and findings, in case any of you brilliant 308ers might have some insight onto what else I can try. Initial malfunction state: as of this morning, rotating the light switch to the ON position, (with stalk in center position) initiates an endless cycling of the headlight buckets (they go up and down, one slightly faster than the other, gradually getting off-phase). When the light switch is rotated to the OFF position, the lights turn off, and the headlights freeze in their current position (IE: they DO NOT self-park, as they should). Light motor cycling occurs identically in the other two stalk positions correlating to high-beams and parking lights. Lights do not illuminate in any switch or stalk position. First corrective action: removed light switch cap from stalk. Noted broken sodder connection on green wire. Fixed sodder connection, and reassembled switch. Result: Same exact behavior (cycling motors, no self-park) except that the lights now work (correctly in all three stalk-positions). Second action: removed and replaced 30 AMP headlight motor-control relay with (presumed) good spare. Result: No change in malfunction. Third action: Removed and replaced each individual 20/30 AMP motor relay with a known good relay from elsewhere on the panel. Result: No change in malfunction. Forth action: opened and checked resistance on the two connections to each headlight motor. Each motor has two pairs of wires. A black and black/gray pair, and a green, green/black pair. As we understand it, each pair goes to one of two diodes in the headlamp motor. We would expect detectable one way flow through each pair. So low resistance, measured in one direction across a wire-pair, and infinite resistance in the other direction across the same pair. Result: tested both motors, reading resistance each way across both pairs. We got the expected results (infinite, and 0.5) on the black and black/gray pairs on BOTH headlight motors, and we got the infinite in BOTH directions on BOTH of the green and green-black pair. In other words, we did not find a smoking gun. we found TWO smoking guns--which made us question our understanding of the system. All we know know is that they are either BOTH good, or they BOTH have one bad diode connecting the green and green/black wires. Fifth Action: just for GP, we left one headlight motor disconnected, and turned on the headlight switch, then reversed the configuration to test other side in isolation. Result: powered in isolation, each headlight exhibited the same behavior as previously, cycling up and down, and not self-parking when the switch was turned off. At that point, we were out of ideas that did not involve removing the headlight motors, cutting through the thick rubbery crud they are coated in, and trying to replace one or both diodes. That seemed like entirely too much work to start at 4:30 in the afternoon on a Sunday, when we had been messing around with various old cars since 9:30 in the morning. The one thing I thought of, but did not check was the steering column connection of the light switch stalk; but since the lights themselves illuminate correctly, (now that I soddered the wire in the switch back in) I kind of doubt that has anything to do with it. The only thing I can figure is that (maybe) having a broken/intermittent connection in the switch might have somehow damaged the control diodes in both motors. Seems far-fetched, but that is the only way I can believe the results I am seeing. That, or my car is just trying to punish me for my protracted absence. Any suggestions? Thoughts? Pearls of wisdom? Thanks in advance for the help.