Johnson stops dead!

film495

Petty Officer 1st Class
Joined
Apr 8, 2009
Messages
285
I'd be looking at ignition switches, kill switches, anything with an electrical contact that could be failing, or look for frayed wires, loose wires. I wouldn't be to ambitious to pull the flywheel if you don't have to. for testing you could also figure out how to bypass switches just to test, or I think that can be done with a voltmeter or ohm tester, but I was never really good at that myself.
 

iggyw1

Ensign
Joined
Oct 24, 2011
Messages
954
I'd be looking at ignition switches, kill switches, anything with an electrical contact that could be failing, or look for frayed wires, loose wires. I wouldn't be to ambitious to pull the flywheel if you don't have to. for testing you could also figure out how to bypass switches just to test, or I think that can be done with a voltmeter or ohm tester, but I was never really good at that myself.
I looked at the wiring but I do not see anything that looks bad. I will open up the control box and check out the wires in there on the ignition switch, but as far as testing with an ohm meter, that is actually out of my league. I talked to the mechanic that I use when things go haywire, and he said it may be very difficult for him to diagnose because it's hard to duplicate the problem I had while it is in his shop. But he could check with his ohm meter I'm sure things like the coils, stator and such at his hourly rate. Like I said, I hope I solved the problem by putting in a new power pack. Cannot get on the lake here until Thursday morning now to try it out. Will post my results. This thread is getting quite long, so I better get out there and run it to see what it does for me. LOL
 

iggyw1

Ensign
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Oct 24, 2011
Messages
954
FINAL UPDATE: First of all, can someone tell me how to label my heading on my post as an "update" with the date after it so guys will know when they see the heading of my post that I updated it? I would like to do that in my future posts like "Top secret file" heading did in the post a couple posts above this one. Thanks.
Now my update 8-22-24 : I changed my power pack on my Johnson 35 H.P. motor, 1983 model a few days ago because it was dying while WOT or cruising speed like someone turned off the key, and would not start again for about 10 minutes, then die again after just a few minutes of running. I finally got a chance to take her out on the lake today to test my repair and it worked out just fine. I drove around at WOT and cruising speed up and down for a solid 20 minutes 16-24 M.P.H. without the engine dying on me, so my problem is solved I believe. Thanks to all of you for your input on my post. It all helped me out and I learned a lot from you guys. Thank you!!
 

saltchuckmatt

Commander
Joined
Jul 19, 2019
Messages
2,645
Here's what I'm picturing, you started it up and slowly pull away from the dock, anticipation in the air you bomb around at 100 miles an hour waiting for it to die and it doesn't. Then you say to yourself, don't get "cocky"it still might die. And then it doesn't......
💪
 

iggyw1

Ensign
Joined
Oct 24, 2011
Messages
954
Here's what I'm picturing, you started it up and slowly pull away from the dock, anticipation in the air you bomb around at 100 miles an hour waiting for it to die and it doesn't. Then you say to yourself, don't get "cocky"it still might die. And then it doesn't......
💪
That's about how it went down. LOL I pulled away from the dock with about a 50 yard ride to the lake at about 5 M.P.H. Took her up to about 1/4 speed for about 2-3 minutes then 1/2 speed for about 5 minutes. Went in a big circle as to not get too far away from the dock. Opened her up and went full speed for about 5 minutes then 1/2 speed then full speed. All the time waiting for it to just shut off. It did not shut off!!! I am hopeful now that the problem is gone. My next time out, I will still not go too far from shore, but will give it a good workout before I head out to my fishing holes about 2-4 miles out. I have towing insurance, so I am not too worried about getting back in actually. Thanks for your help, sir.
 

Nordin

Commander
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Jun 12, 2010
Messages
2,555
As my note in post #6, electronic components can fail when get old and heats up.
I have had the same issues with at least 3-4 engines (Mercurys 7.5 and 9.8Hp in this case if I do not remember wrong.).
As a roll of tumb is that electronic components lifespan is shortened by half if the ambient temperature is 50 dgr Centigrade (122 dgr F) or more.
 

jonesg

Admiral
Joined
Feb 22, 2008
Messages
7,198
That's about how it went down. LOL I pulled away from the dock with about a 50 yard ride to the lake at about 5 M.P.H. Took her up to about 1/4 speed for about 2-3 minutes then 1/2 speed for about 5 minutes. Went in a big circle as to not get too far away from the dock. Opened her up and went full speed for about 5 minutes then 1/2 speed then full speed. All the time waiting for it to just shut off. It did not shut off!!! I am hopeful now that the problem is gone. My next time out, I will still not go too far from shore, but will give it a good workout before I head out to my fishing holes about 2-4 miles out. I have towing insurance, so I am not too worried about getting back in actually. Thanks for your help, sir.
nice. !
 

iggyw1

Ensign
Joined
Oct 24, 2011
Messages
954
Your welcome....where's here, somewhere on a great lake I presume?
I fish Lake St. Clair in Michigan. It is between Lake Huron to the North and Lake Erie to the south. St.Clair River connects LSC to Huron while the Detroit River connects LSC to Lake Erie. Hard to beat the fishing on Lk. St. Clair for all species that are in the great lakes. Cannot keep the bass off of our hooks, and huge muskies. pike , perch, walleyes. any fish you want, so I am spoiled when it comes to "catching" rather than fishing. LOL
 

iggyw1

Ensign
Joined
Oct 24, 2011
Messages
954
As my note in post #6, electronic components can fail when get old and heats up.
I have had the same issues with at least 3-4 engines (Mercurys 7.5 and 9.8Hp in this case if I do not remember wrong.).
As a roll of tumb is that electronic components lifespan is shortened by half if the ambient temperature is 50 dgr Centigrade (122 dgr F) or more.
Yep, it was definitely that power pack that was probably heating up like so many were telling me, so I started with replacing that first. I got a new Sierra power pack delivered in one day from Amazon for under $50, and it did the trick, so really cheap repair to say the least. If the same thing happens my next time out, I will pull the fly wheel and take a look at the coils under it. I know they can be tested with the flywheel in place as per Racerone acknowledged, but I want to take a look at them to see if they are all brittle and cracking even if they are still testing o.k. Saw some photos on line that when the flywheel was removed, those coils were all busted up. Thank you for your help.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,827
Your motor does not have ignition coils under the flywheel.-----There is a very reliable charge coil.----And there is a very reliable sensor coil.-----I have never seen those --" all busted up "-----You need to be sure of what your motor has before jumping to conclusions.
 

saltchuckmatt

Commander
Joined
Jul 19, 2019
Messages
2,645
Yes, I'm a "Catcherman" myself....lots of salmon, cod and halibut. Salt water guy obviously.

Many moons ago I watched some TV shows where guys were catching huge giant mutant king salmon on lake Erie. Do they still have those fish?

Glad you got the the boat going.
 

jonesg

Admiral
Joined
Feb 22, 2008
Messages
7,198
Yep, it was definitely that power pack that was probably heating up like so many were telling me, so I started with replacing that first. I got a new Sierra power pack delivered in one day from Amazon for under $50, and it did the trick, so really cheap repair to say the least. If the same thing happens my next time out, I will pull the fly wheel and take a look at the coils under it. I know they can be tested with the flywheel in place as per Racerone acknowledged, but I want to take a look at them to see if they are all brittle and cracking even if they are still testing o.k. Saw some photos on line that when the flywheel was removed, those coils were all busted up. Thank you for your help.
you can troubleshoot a heat failing pack with a can of freeze off.
 

iggyw1

Ensign
Joined
Oct 24, 2011
Messages
954
Yes, I'm a "Catcherman" myself....lots of salmon, cod and halibut. Salt water guy obviously.

Many moons ago I watched some TV shows where guys were catching huge giant mutant king salmon on lake Erie. Do they still have those fish?

Glad you got the the boat going.
King salmon in Lake Erie are very, very rare. You hear about one or two caught every once in awhile. For some reason, they do not like Erie too much. We get salmon mostly in Lake Huron and the upper St. Clair River. Lake Huron flows into the river and the river empties into Lake St. Clair. The occasional salmon caught not too much in Lk. St. Clair, more than in Lake Erie for sure, but more so in the three river channels that empty into Lk St. Clair. The channels are much deeper & colder, and good current. Lots of sturgeon up to 80-90 pounds as well in the St. Clair River. They go up to 100 pounds in the river as well. Tons of walleyes. The St. Clair River splits into the North, Middle & South channels before it empties into Lk. St. Clair. Ships travel thru the South Channel. Gotta stay out of their way!
 

iggyw1

Ensign
Joined
Oct 24, 2011
Messages
954
Your motor does not have ignition coils under the flywheel.-----There is a very reliable charge coil.----And there is a very reliable sensor coil.-----I have never seen those --" all busted up "-----You need to be sure of what your motor has before jumping to conclusions.
Thank you. If I do anything at all, IF I still have a problem with the motor just shutting off, I was going to remove the flywheel just to look at what's under it without really touching anything unless it's looking like something needs to be replaced, like busted up coils or a bad looking stator. I do not really want to have to do anything under the flywheel because I really do not know what's under there, and I am not a motor mechanic, but I do like to learn, and sometimes, I do learn the hard way, but not always. Thanks for all of your help, Racerone. I really do appreciate it. I am hopeful that the motor has been repaired now as it ran perfect the other day after I replaced the power pack. Hope it runs like that the next time out when I will be out for a much longer test run and some fishing.
 
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