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ok guys heres the problem...
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Re:ok guys heres the problem... 14 years 1 month ago #19530

  • Oceans2
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I'm wondering if The coil voltage 'could' be feedback from a closed set of points?? O2 or Jim Sprig??
Thom

Eactly my thoughts. I am just an old auto tech, street rodder/hot rodder and new to outboard engines and wondering what part the rectifier would play in this situation?

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Re:ok guys heres the problem... 14 years 1 month ago #19539

  • vuyosevich
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i just tapped on the cut off/mercury switch as jim advised and tried to start. it immediately tried to start. i turned the key to run and it stalled. it was very quick less than a second. i tried to restart but my battery almost immediately died out. i am charging it overnite and will try again in the morning. hopefuuly this is the problem, where could i buy a new mercury switch? ron
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Re:ok guys heres the problem... 14 years 1 month ago #19544

I may have one Ron, I'll have to go look........

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Re:ok guys heres the problem... 14 years 1 month ago #19545

disconnect the gray mercury switch.then try the gray ones gave trouble i am suprised they are still around.

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Re:ok guys heres the problem... 14 years 1 month ago #19546

Ok, according to my schematic, when the switch closes during an "event", it shorts the point sets together shutting off the engine. You need a normally "open" switch for normal operation. You can remove the switch as Dave suggests and hope you don't have another event. Or, if the tapping returned the mercury to it's home postion and the motor starts after the battery is fully charged, leave it alone.....and hope you don't have another event. I don't have a switch......sorry.

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Re:ok guys heres the problem... 14 years 1 month ago #19554

  • MarkS
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Ron, if you will go to the third post on page one, (or the 19th), all you have to do is unhook that switch. Leave the wires coming in from the front, and re-tighten the terminal screws. It really doesn't NEED replaced, at least to test it. That switch was unhooked, but still on the motor when I bought my '62 Model 700, and I never did replace it! Just tryin' to help you out buddy. ;)

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Mark

Re:ok guys heres the problem... 14 years 1 month ago #19555

Hi Ron,' I'm not a Merc expert but I have a feeling it is in the distributor some were. Rotor? Mine come apart one day on my Merc 700. Hence no spark.
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Re:ok guys heres the problem... 14 years 1 month ago #19557

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if i can't start it tomorrow i'll take it off. what is the purpose of it if its not needed.

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Re:ok guys heres the problem... 14 years 1 month ago #19561

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(Thats a safety switch that grounds out the ignition system to shut the motor off if you hit something that kicks the motor up.)

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Mark

Re:ok guys heres the problem... 14 years 1 month ago #19566

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mark if you read my earlier post thats exactly what happened. i hit something in the hudson river when i was up at franks. at first i thought i spun the hub. the motor did not stall though. i was at full speed and after i hit the object it slowed down to a troll speed. when i tried to power up it just revved and would only move at a trolling speed. i trolled back to the dock and dropped franks son off. i did not stop the engine but went right back out and it powered up as if nuthin had happened. the next time i tried to start it was when i wanted to winterize it last week and it would not start. i'm pretty confident now that it is that switch. we'll see tomorrow. ron

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Re:ok guys heres the problem... 14 years 1 month ago #19570

just a thought if nothing else check the timing belt.broken or sliped a tooth or 2...

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Re:ok guys heres the problem... 14 years 1 month ago #19571

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thats beyond my ability dave but thanks for the tip. you bunch of guys are appreciated more than you'll ever know. ron

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Re:ok guys heres the problem... 14 years 1 month ago #19577

just look up under the top cowl above the distributer and look for it and see if it is broken.not hard.to check if it slipped needs removalof belt.

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Re:ok guys heres the problem... 14 years 1 month ago #19581

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ok dave.

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Re:ok guys heres the problem... 14 years 1 month ago #19595

Ron,
If you conclude that the mercury switch is the culprit and you want to replace it even though most folks simply disgard them,...I more than likely have a spare, or two, or three.
:)
O2,
The rectifier converts the AC voltage made by the stator to DC volts to charge the boat battery.
Interesting thought O2,...And I am not sure, but I suspect this ignition would still work with a pretty weak battery - Jim??
I know that the late '69s-'79 CDI fired Mercs are more dependent on a hot battery with constant voltage.
Thom
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Re:ok guys heres the problem... 14 years 1 month ago #19604

Dr_Frankenmerc wrote:

And I am not sure, but I suspect this ignition would still work with a pretty weak battery - Jim??


Not necessarily Doc.....remember, you are basically running 2 automotive systems in these beasts. Those starters will draw enough juice away from the coils to not allow enough saturation and cranking rpms at the same time ( keep in mind the amount of compression also ).

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Re:ok guys heres the problem... 14 years 1 month ago #19624

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ok...thanks thom. and good luck with your back surgery. i'm sure you will be fine. ron
off to pennsy now to pick up my garage building plans. will be back at 4:00 and see if the merc starts. been charging battery overnite.

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Re:ok guys heres the problem... 14 years 1 month ago #19636

Thanks for confirming that Jim.
I wasn't sure, and hadn't even considered it until O2's inquiry regarding the rectifier suggested a low battery as a possibility.
It certainly makes sense with the starter draw and compression factors for sure.
Thom

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Re:ok guys heres the problem... 14 years 1 month ago #19653

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just got home from pennsy and ran over to the boat. i was so anxious i didn't even let my wife in the house first,lol. turned the key and she fired right up. whoop whoop! so i guess i'll leave that mercury switch on. thanks again guys for all the help. mark hit it right on the head from the beginning about the mercury switch. i never disconnected it from the screws onlt from the holder. then sgrig told me to tap on it and thats whats did the trick. ron

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Re:ok guys heres the problem... 14 years 1 month ago #19659

Sometimes the simplest things can really mess you around.
All the people on this site are the greatest!!! :)

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Re:ok guys heres the problem... 14 years 1 month ago #19667

does anybody else find it interesting that there is mercury in a mercury,or am i the only goofy one,lol,

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\"too soon old,too late smart\" my pap

Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.“

---Mark Twain

Re:ok guys heres the problem... 14 years 1 month ago #19672

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yeah maybe they should of called it the"johnson thingie" :laugh:
john....call me

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Re:ok guys heres the problem... 14 years 1 month ago #19673

i will garantee if you had a problem with the mercury switch you will have it again. replace it with a newer version may have to modify the wire length.they are much better even used ones.

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Re:ok guys heres the problem... 14 years 1 month ago #19720

Dr_Frankenmerc wrote:

Thanks for confirming that Jim.
I wasn't sure, and hadn't even considered it until O2's inquiry regarding the rectifier suggested a low battery as a possibility.
It certainly makes sense with the starter draw and compression factors for sure.
Thom


Remember the old Chevy starters with the 2 wires going to the solenoid? The one marked "S" was for your cranking/starting cycle. It bypassed the ballast in the ign circuit to allow full batt voltage to the coil during cranking for sufficient coil saturation. Otherwise, the thing would pop off just as you released the key from the crank position.....remember that??

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Re:ok guys heres the problem... 14 years 1 month ago #19737

  • Oceans2
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I sure remember. We run a '55 Nomad with a 427ci.Hot starts were always a issue until we installed a ford style solenoid that now provides a true 12+ volts with little lose to the starter solenoid "I" terminal.

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Re:ok guys heres the problem... 14 years 1 month ago #19740

I did the same with my 23t. I run a 406 sbc and have the ford solenoid under my dash, not too far from my MSD box. Built it like that right from the start. Never had a problem with a hot start.

Also had an '86 GMC pickup with a small block and headers with a ford solenoid mounted on the chassis rail forward of the starter.

Frank

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Re:ok guys heres the problem... 14 years 1 month ago #19883

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Ron,

Glad the problem has been resolved and I even learned a few from your thread.


Frank,

Cute T bucket. What boat do you tow with it? ;)


Here's our daily driver when the weather permits.It pulls a matching teardrop trailer.Slightly warmed over 350 sbc/ 2spd PG powered.
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Re:ok guys heres the problem... 14 years 1 month ago #19890

No problem towing much with that little car, it has lots of torque. Problem is getting those rear tires on a wet, algae covered boat ramp...

Nice hot rod ya got there. One of these days, I'm gonna build a tear drop.

Frank

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