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I have a 12 volt fan cooling an air compressor in my van that is powered when the compressor is on. I need a timer/relay that allows the fan to keep running for 3 or 4 minutes after the compressor shuts off. Anyone know what I can use?

Does anyone know of a poor man's timing retard for factory Mopar electronic ignition? The 340 I am working on currently, likes 20 degrees initial and I have modified the distributor for 34 total. The problem is it kicks back sometimes during cranking and has broken 2 starters.