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    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    maybe recovering from covid is making me do crazy stuff... yesterday, rip the old sensor apart without stepping back to understand why the screw popped loose but then locked up... today, grinded the new sensor to align to the holes in the housing, didnt want to wait for new part....install the...
  2. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    of course I didn't...that would be no challenge :) ....arggg, the aftermarket sensor screw holes dont align up to the housing....I only bought it cause it was one day shipping....will order the OEM today
  3. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    agreed....first thing tomorrow morning...then wait for rotor
  4. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    haha, just found the root of my issue...there's a nut holding a BLACK wire to that screw...on the bottom of the housing....arggggg!!!!! removed that and with a vise, was able to remove the exposed screw....only took all day to remove this....two trips to shop to buy tools to remove stripped...
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    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    that screw is not coming out, looks like it will break... can I break it and drill right thru it...this would be OK correct since theres nothing on the other side....the screw looks like it goes right thru to the other side of the bottom plate which screw is used for GND or its not in this new...
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    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    I screwed up royally....I stripped the sensor screw and bent it....I broke the sensor to expose the screw but still cant remove with a vise...I used a dremel to cut a groove for a flat head screw driver and now its really messed up :)
  7. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    it was pretty easy melting the plastic with a soldering iron. came right out so close but yet so far, the two screws for the sensor is locked tight...using PB blaster, was able to remove one but stripped the other, yikes... its OK to spray BP blaster in that area correct???
  8. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    gotcha, I misread....thought the cap was loctited and was so relived when I easily remove it :).... OK, saw on youtube, someone cut the rotor open with a hot knife, less messy and less likily to damage anything...will try that...
  9. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    feeling better today so back at it this morning...removed the disti cap, pic below the sensor is below the rotor...do you have to remove the rotor to install the new sensor...the rotor feels stuck and probable wont come off without some brute force.... Before I apply brute force, just want to...
  10. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    understand, I was just curious and asking random questions... I was referencing the "deadman" switch. achris and scott have answered my question...thanks....
  11. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    "The kill switch interrupts the 12v supply to positive side of coil (purple wire)." Thats what I thought but it seems no matter what position the kill "man overboard" switch was on, I was getting 12V to the coil...I did this 2 wks ago so maybe I did it wrong...clueless back then...will test...
  12. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    if I can manually cause a spark, does that mean all the wiring is OK....the kill switch and wiring is OK ???? I'm just curious, where does the kill switch wiring go to, tried to trace it on the boat but too many wires and long :)
  13. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    sorry to complicate my issue with a bench test...anyhoo, followed yalls recommendation to put back into boat and follow flowchart got 12V coming out of the module, then rapidly strike the GRN/White wire from module to GND, got sparks out of the ignition coil...YEAAAAAA Looks like the issue is...
  14. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    thanks, that seems complicated...I'm leaning towards just putting the coil back into the boat and use the flowchart to see if I can throw a spark...thanks
  15. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    thanks all, I have gone over the flowchart how to debug the ignition several times. great stuff... What I wanting to know if my setup to throw spark using a 12V battery and toggling the Battery GND to the Minus of ignition coil is correct...if so, then the new ignition coil is bad also and I...
  16. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    found parts daigram, not too complicated to replace the sensor
  17. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    I watched wrong video so I'm not sure what I saw :) So I dont know how to install yet sensor looks like 3 wire- red/white, grn/white and a black
  18. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    disregard the question...looks like I have to remove the distributor cap but dont have to mess with all the other stuff underneath to get to the sensor
  19. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    how true, but I would be so excited just to get sparks right now ... on a different note, do you have to remove the distributor cap to replace the ignition sensor....still researching for potential problems
  20. L

    2005 Mercruiser 5.0 thunderbolt V ignition has no sparks

    too bad I can't produce a spark from the ignition coil manually...I'm ready to follow the flow chart to isolate the issue....looks like there are only 3 parts that could be the issue if all the wiring is OK...the sensor, module and coil itself
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