You could always trace your wiring... May have a rub in the harness, bad solder joint at the socket or some other reason for intermittant contact.

Does it ever die or does it just not start?

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.