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  1. R

    Where does the Purple Wire go?

    I have a 1973 StarCraft with a 120hp GM inboard. I replaced the alternator and have different color wires. There's 2 red wires, a purple and a black and a orange with blue line.
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    1973 mercruiser 120 HP no spark

    I have a 1973 mercruiser with a 120 mercruiser. I put a volt meter on ohms and the red probe where the plug wire goes with key on I get 9.49 ohms, I try to start and I get the same. I have a flame thrower petronics and petronics electronic ignition.
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    Ballast resistor question Mercruiser 4 cyl

    I have a 120 horse with a balast resistor and electronic ignition I only seem to get 8.8 volts cranking and 12 volts not cranking.
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    Mercruiser overheating

    Water is not coming out of the thermostat.
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    Mercruiser overheating

    Does the boat have to be in water or can I use earmuffs? I am getting water to thermostat but not after. I brought thermostat from Amazon so it very well could be the wrong one??
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    Mercruiser overheating

    The boat is a 1973 don't know if ever replaced? I brought the boat as a fixer upper.
  7. R

    Mercruiser overheating

    No I didn't replace the risers nor the exhaust manifold has been replaced. Can they be cleaned out?
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    Mercruiser overheating

  9. R

    Mercruiser overheating

    I have a 1973 mercruiser 120hp. Motor is overheating. I put new water impeller, thermostat. I took off the hose going to motor from impeller really good flow, I took the hose off after water pump good flow, took water off before thermostat good flow then took off hose after thermostat no water.
  10. R

    1973 mercruiser 120 HP no spark

    Right now I am waiting for parts and resister.
  11. R

    1973 mercruiser 120 HP no spark

    I ordered one.
  12. R

    1973 mercruiser 120 HP no spark

    Yes as close as I could no dwell meter, I replaced the r wire and still getting the same 12 volts key on 10 key in start position.
  13. R

    1973 mercruiser 120 HP no spark

    There's a spark a little faint.
  14. R

    1973 mercruiser 120 HP no spark

    So I guess my next step is to get new points and see what happens???
  15. R

    1973 mercruiser 120 HP no spark

    So I bought this boat as a project. Mistake??? The trim motor didn't work, there is 2 wires coming out of the stern where the outdrive connects to the motor. The wires were bare. So I abandoned the old trim and put in the up and down solenoids.
  16. R

    1973 mercruiser 120 HP no spark

    Okay I cleaned everything up, getting 12 volts key in on position. Getting 10.5 @ in start position. I do have a spark at the points. Good sign?? I surely hope so.
  17. R

    1973 mercruiser 120 HP no spark

    I burned up the points, I will get some today and re check read
  18. R

    1973 mercruiser 120 HP no spark

    I burned up the points, I will get some today and re check reading
  19. R

    1973 mercruiser 120 HP no spark

  20. R

    1973 mercruiser 120 HP no spark

    The tan wire is connected to the white wire that is cut off under the dash, the brown wire is not connected to anything. I took a pic , the brown was wrapped in tape.
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