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  1. K

    Tach on 77 merc 70hp

    I have a 77 merc 700 with thunderbolt ignition. I have a tach connection on the front of the mercontrol i haver heard on this site that you should be able to set the tach to 5pole and use that tach connection. i am just double checking that this is the correct way and pole setting for my...
  2. K

    77 merc 700 no spark

    i have a 77 merc 700 and i have spark tested all the cylanders and number 1 cylander would not spark so i replaced the coil wire and coil but still no spark this engine has a ignition coil for each cylander and one switchbox. i think because the other two cylanders work it cant be the switrch...
  3. K

    crossed wires on switchbox?

    i have a merc 700 1977 o/b and on the switchbox two of the wires going to two coils are crossed wile the third which isnt firing because of a bad coil which im replacing today is not crossed. lower switch box plug ----- to lower coil #1 middle switch box plug ------ to upper coil #3 to top...
  4. K

    merc 700 70hp stalls

    I have a merc 700 with thunderbolt ignition serial number starts with 457.... my problem is the boat does not do over 6mph it starts up and idles pretty good shakes a little but when i go to add gas past 1/2throttle (to go faster than 6mph) it stalls and dies in about 3seconds. well during the...
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