Quote:
Originally Posted by Jeremy5848
The relay should not be able to re-energize until the ignition switch has been turned off and then back on. The famous "violet wire" from the ignition switch to the preglow relay tells the relay that the engine start cycle is complete. The preglow relay then turns off. If this wire or the contacts in the ignition switch have a problem, the pre-glow relay could be fooled into thinking it's time to glow.
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The violet wire has no involvement in cycle
initiation. The wire that becomes energized in RUN serves that function. An intermittent connection in that wire would have the same effect as cycling the key switch from RUN to OFF to RUN. Ordinarily, the preglow lamp would illuminate if that occurred.