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  1. Bt Doctur

    No start

    if Alpha there is the shift interrupt switch that ground out the coil.then depending in what Thunderbolt you have the ground lead for the amplifier may have broken Have you done the thunderbolt testing sequence?
  2. Bt Doctur

    Fuel Transducer Location?

    you have a carb and a mechanical or electric fuel pump. what is the actual issue.?
  3. Bt Doctur

    Impeller pump cover

    rubber does not corrode ,it just melts running warm, after about 100 hours of use over time it overheated and water was in the cylinders, so i inspected t How warm ?if you ran it over 140 or 160 you caused the water in the cylinders
  4. Bt Doctur

    Model year 2012 Honda BF40A charging system ions

    start with painting/taping the battery lugs and cable connections RED most times the charging system is AC voltage to the rectifier. Start there , disconnect. the yellow leads and read the AC voltage,If in spec reconnect and read the DC voltage. if 0 rectifier has failed
  5. Bt Doctur

    Starter Slave Solenoid

    should be 2 cube relays port side just aft of the throttle body, there also is a thin rectangular fuse holder also
  6. Bt Doctur

    Rotation

    all 4.3`s are left hand rotation when viewed from the flywheel. all merc drives have a right hand rotation OF THE PROP
  7. Bt Doctur

    4.3 longer cranking after sitting few days n when hot

    A week of high temp will vaporize fuel from the carb and leave the bowls dry.Results in excess cranking .If you have an electric pump you can add a momentary switch to prime the carb usually installed in the eng compartment . You do always open the engine compartment to sniff and look first ,right?
  8. Bt Doctur

    Bad Engine Ground?

    Most issues are caused by the steel ends crimped on the cables instead of copper ones. Also the ends of the cable where its crimped are usually black from corrosion. Cutting back to clean copper and recrimping copper connectors solve the voltage problem
  9. Bt Doctur

    Need Help with 8.2 Mercruiser

    get a better mechanic. could be just some leaking valves from water intrusion or holes in the piston at its worst. Only by removing the head will you be sure
  10. Bt Doctur

    88' Mercruiser 165 harmonic sound

    Ill take a guess and say a cracked flywheel dust cover if its a metallic clanking . Had the same thing happen on mine a long time ago
  11. Bt Doctur

    Thunderbolt IV

    just a guess the tach was causing an issue running the motor,does the tach work now? Blue in that area is the oil pressure sensor and the Blue/white(tan) may be for the "no oil pressure sender"
  12. Bt Doctur

    T-Stat for closed loop cooling system?

    Meaning the housing has a restricted opening to regulate the engine temp, If you also install a stat it will overheat
  13. Bt Doctur

    Stern drive gasket cracked, should I be worried?

    what torque value did you use.usually tight with a 3/8ths ratchet
  14. Bt Doctur

    Starter install help.

    In most cases. there is the main battery cable , then a red,or red/purple .This is the boats main power connection,then the yellow/red wire to the solenoid Some use an additional wire from the other small post on the solenoid to provide voltage to the electric fuel pump for cranking
  15. Bt Doctur

    OMC I/O first test drive, need some part names.

    most just pass the cable thru a hose that is threaded into the transom housing number 40
  16. Bt Doctur

    1995 OMC Cobra v-6 will not rev out under load

    firing order correct? 1,6,5,4,3,2
  17. Bt Doctur

    Mercruiser 3.0 LX spark plug failure

    its not unuasual
  18. Bt Doctur

    2009 Mercruiser 4.3l engine wiring diagram

    helpful if you describe the problem your having
  19. Bt Doctur

    1989 Sea Ray thunderbolt no spark

  20. Bt Doctur

    Which coil to use?

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