Have you checked that your battery is healthy? On my '85 w123 found that the original relay (that is, original part number) was sensitive to voltage drop and that manifested through intermittent no-glow. (Two different relays did the same thing.)

I found the later, 'universal' relay (w126/w123/w201), slightly smaller with a different part number, worked just fine with a weak battery.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22