Yes, glow relay is a signal, but I can't remember what. check/change GPs and the relay should be normal, unless it is a signal that the relay is failing.

Horn issue sounds like a ground problem.

Glow plug issue may be the diagnostics in the relay telling you that the system has a problem (usually one or two burned out glow plugs, but maybe related to the horn issue).
Max Dillon
Charleston SC
'87 300TD
'95 E300


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