Search results

  1. R

    72 Mercury 500 No Spark

    I went ahead and purchased both the 69 engine and the 70 lower heres a few more pics of both
  2. R

    72 Mercury 500 No Spark

    I understand its not ideal but puts me in a better situation than I'm in currently. I may still try and get the 50hp runnin and then sell it to re coop some funds. Who knows it might free up the rings when it fires. But I still need a $450 switch box just to try... I went to remove the top cover...
  3. R

    72 Mercury 500 No Spark

    Thats the info I needed, thanks a bunch. They both say 20" shaft and inline 4 The 65 is saying cyl. 1,2,3 have 125psi and cyl4 has 105. Currently starts and runs.
  4. R

    72 Mercury 500 No Spark

    Ok so I'm about to pull the trigger on this 65hp and the lower. The engine serial is 2713736 (1969) The lower serial is 2804236 (1970 I believe) Anyone feel free to correct me if I'm off on those serial years. Hopefully it'll work Thanks again
  5. R

    72 Mercury 500 No Spark

    I found this engine and lower anyone know if these are compatible or look right? Engine serial is 2713736 not sure on the lower unit numbers
  6. R

    72 Mercury 500 No Spark

    Im going to get another to verify seems like the guage may be whack. I found a 1969 65hp for sale that runs with no lower unit would my 72 lower work to swap over?
  7. R

    72 Mercury 500 No Spark

    Right on looks clean man I got around to doin a compression check and I'm reading 95-100 on all cylinders and now im not sure what direction to go. Seems pretty low
  8. R

    72 Mercury 500 No Spark

    Thats beautiful, really cool shot. What was that on? Haven't gotten around to the lower unit at all yet. Any idea what voltage I should see out of the ign driver to to the switch box?
  9. R

    72 Mercury 500 No Spark

    I do believe the 75 is the same because in 76 they changed the coil and switch box and ive seen those diagrams they are certainly different. The belt is definitely intact maybe a little loose but spins the driver forsure. I don't have a voa meter and or thunderbolt analyzer but at least now I...
  10. R

    72 Mercury 500 No Spark

    Ok so I'm fairly sure my switch box is shorted out because with all wires disconnected the blue and white posts have continuity to ground. I checked all the wires while disconnected from the switch box and none were grounded. I've found a NOS switch box online for about 400 I definitely...
  11. R

    72 Mercury 500 No Spark

    Thanks merc850, So from what I understand in a normal condition the blue switch box terminal is momentarily shorted to ground to stop the engine. And what I'm seeing is my blue switch box terminal is permanently shorted to ground (as is the white switch box terminal too) like im holding the...
  12. R

    72 Mercury 500 No Spark

    Hey Guys new to the forum, found a lot of good info on here so far. Thank you Just picked up a 1960, 16ft. Glasspar Citation with a 1972 Merc 500 50hp with no spark. I'm a carreer marine mechanic but strictly inboard diesel so this is all new territory for me. Here's where I'm at... • Known...
View older results
Top