I had an issue in hot weather the fan would either turn markedly slower or would cease working all together. The fan itself works great, so I decided to replace the regulator. With the new regulator installed, even on the high setting, the fan cycles weakly on and off every 5 or 6 seconds. It's way worse. Anyone have any ideas? I can order another regulator since replacing it obviously influenced the fan's operation. But before I do that, is there anything I could have missed? A ground wire or another connection of some kind I may have overlooked?

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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI

Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D