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    1977 Merc 500 Cooling Problem

    I've got a 1977 Merc 500. Last year I replaced the impellor at the end of the season because the water just didn't seem to **** out very strong. First day out this year the motor would only **** water if running at a high RPM. If the motor was at a low RPM it would **** out steam from the...
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    Merc 500- No spark on #3 cylinder

    I've got a Merc 500, 1977, Serial #4578711. Not getting any spark on #3 cylinder. Could the switch box be bad? I swapped out the coils on #2 and #3 but the same cylinder still has no spark. This tells me that the coils are fine. If it is the switch box, how much money are these things?
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