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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