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Old 11-20-2013, 05:38 PM
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sixto sixto is offline
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Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,806
If the relay has 5 pins in the smaller connector, it's an afterglow relay. The fifth pin, actually marked pin 6 since space 5 is blank, is for a coolant temp sensor. Afterglow time is determined primarily by coolant temp. FWIW, preglow indicator time is more dependent on engine temp than in a conventional relay. If you restart a hot engine, you might not notice the preglow indicator come on because it'll go off very quickly even if the plugs are still energized. I don't know if preglow cycle time varies with engine temp or is different from the maximum cycle time of a conventional relay.

If it fits, try it.

Sixto
87 300D
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