For a 1977 xj6c with a chevy conversion: Outside headlamps, L & R, work–good brights and dims. But the inside headlamps, on high beam, only the passenger ® side works. the driver’s side (L) doesn’t. Just replaced the dimmer relay. That made everything work OK, THEN the next time I started the car, same old problem, the outside L & R lights went on per the switch, both low and high, but on high beam only the inside light on the passenger lit up, the driver’s stayed dark.
Is something in the relay burning out?