Search results

  1. T

    1990's Sport Craft Avanza 3100 battery charging question

    Hi All, I'm working with a mid-1990's (1993 I think?) Sport Craft Avanza 3100 Cruiser. The batteries charge just fine off the motors, but when shore power is attached the 12 v system does not recharge off the 120 v system. There's a breaker on the main panel labelled Battery Charger, and I...
  2. T

    DF25 Iced up peehole in extreme weather

    Duck hunting in super cold weather, sometimes -6 F. Motor starts right up, but can take 5-10 minutes to start pumping water. I realize its *probably* just the tube frozen and taking time to thaw. But how can I know I am not damaging the engine? Impeller could be frozen, or water channels in the...
  3. T

    1969 Merc 500 took a swim, now no spark??

    Well it was a really good storm, boat frayed thru the mooring ropes and ended up on the rocks. Hull is fixable with some fiberglass, but motor got rocked off and ended up completely submerged for about 12 hours. 1969 Merc 500 4 cyl Thunderbolt ignition. Drained water from carb and gas lines...
  4. T

    merc 500 lower unit, 1970 vs 1975 fit??

    I have a Merc 500 50 hp 1970 ser#2742087 Thunderbolt. Lower unit leaks bad. I have a chance to buy a lower unit from a 1975 Merc 50 hp which reportedly has good, clean lower unit oil. Anyone know if this 1975 lower unit will fit my 1970 motor? Many thanks in advance!
  5. T

    Merc 500 50 hp What Spark Plug??

    Ok so I thought it would be EASY to put in new plugs... what was I thinking? Merc 500 1970 ser#2742087 Thunderbolt ignition. Has L78V plugs now, but I know that was a replacement form whatever the original was. I read some old posts on here that say L78V is too hot, they say use L77V... so I...
  6. T

    Merc 500 how to test rectifier

    Can someone walk me thru how to test the rectifier on my 1969 Merc 500 50 hp? (I know, "get a SELOC manual" - I just ordered it!) I don't think the motor is charging the battery. I get 13 v at the battery terminals when its not running, and 13 volts when it is running, no change. I'd greatly...
  7. T

    Merc 500 water pump question

    I almost feel stupid asking this question! I dropped the lower unit to change the impellor. Kept everytyhing perfectly in order on the workbench to put back together..... until my son came along and started playing with the impellor. So now I don't know which direction to curve over the now...
  8. T

    Merc 500 water pump problems

    I have a 1970 Merc 500 50 hp, water pump only pumps much water when you rev the idle. Dropped the lower unit, cleaned pump, looks good, outlet tubes are not blocked, still pumps little water. Dropped lower unit again, hooked garden hose to the tube that carries water up into the motor. Still not...
Top