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Recent content by mjricha83

  1. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    not super young (43) but yes first boat. have worked on cars my whole life and assumed that getting a boat with an inboard would be easier for me to work on than an outboard. don't think i've ever worked on something without electronic ignition though. (most cars/trucks Ive rebuilt were...
  2. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    will do the grease and oil when i set the points again. thanks!
  3. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    hello all, new external resistor coil has been installed. PO red wire removed key on engine off only resistor wire installed on coil pos terminal- 12.4v both wires connected (purpleyellow/resistor) running:11.5-12v battery charging at 13.8v while running
  4. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    yes it could be because you're essentially getting two resistors (one on the wire and one in the coil). but yeah will test again soon. new coil should be here monday.
  5. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    well he did add the red wire to the same post as the purple lead at the key ignition,, and that does get full 12v at the coil. ( i didnt test it connected to the coil though)
  6. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    test results: 1) purple resistance wire disconnected at at coil key on =12.6v 2) purple resistance wire connected on coil key on= 4.6v ( not 14.6, actually 4.6 ) 2) purple/yellow disconnected at coil during crank =10.6v to 11.2v red P.O wire traces to the same post as the purple wire on the...
  7. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    there is no red/purple wire coming out of the harness at the alternator there is a purple wire with a bullet connector coming out of the harness at the alternator but the end that would connect to the alternator is missing so its not connected the red wire is coming out of the harness and is...
  8. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    no it was all standard points/condenser inside the distributor. I replaced them a few months ago with new ones. and dwell/gap as well
  9. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    i can check the voltage at the solenoid during cranking as well just to be sure this isnt the reason why he added the red wire
  10. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    I have replaced the rotor, point, condenser, cap, and have timed and adjusted the point. wires and plugs also new. When i was first working on this a few months ago i noticed the cap had a crack in it, so went ahead and replaced all those things as they were very old. as far as the wires...
  11. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    i just checked you are correct it is black (dist) and grey (tach)my apologies there are three wires going to the positive terminal Purple, purple/yellow and red red is the wire he added that goes to the ignition switch purple is hooked to the distributor positive and is UNHOOKED from the...
  12. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    Thats part of the issue. Im getting 12v all the time. so now that makes sense. the previous owner added a new wire which runs directly from the ignition switch to the ignition coil positive. that must just be a regular wire not a resistor wire. the distributor cap, rotor, condenser, wires...
  13. M

    Tach wires on Mercruiser 3.0

    awesome awesome thank you!
  14. M

    Tach wires on Mercruiser 3.0

    hello, I'm sorry this is an older post but do you possibly have a schematic like this for the 2.5 4 cyl with points? i was looking for exactly this type of diagram. thank you!
  15. M

    Mercruiser 120 Help with wiring the ignition coil (and distributor, possible upgrade to electronic ignition)

    Hello! i have a 1978 mercruiser 120 2.5l 4cyl. ever since i've gotten this boat its run great but after about an hour it shuts down on the water and wont restart. only happens in the water. Im 99% sure I have it solved, I think its the ignition coil. the previous owner had changed it, and A)...
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