I am having troubles with the headlights on my ’91 318is. My headlights (dual Lo/Hi beam outer, high beam inner) will work fine on low, but when I switch to high only the right side headlights will illuminate (outer dual beam and inner high beam). The left side (driver’s) will go dark, and I can’t read any voltage on either headlight plug on that setting. All the fuses are good, and since the passenger side works I assume that the relay is good as well. I swapped inner (Hi beam) headlights between driver and passenger side, with no change (driver side still out). Any suggestions?
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Turns out it was the connector that plugged into the inner high beam bulb. Voltage comes from relay to fuse to inner high-beam bulb and then continues to outer dual-beam bulb. So a break in the circuit at the inner bulb also blocked the outer high-beam function. -
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