evinrude rectifier

Proselect

Petty Officer 1st Class
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Aug 17, 2009
Messages
237
I just bought a used boat from a private party and the tach doesn't work. The guy told me it did, but I have a feeling he knew something was wrong. I have a 1994 Evinrude 112 SPL. I started with the beginning of the tach diag by putting a volt meter on the battery and starting the motor. The battery engine not running was 12.7. With the motor running it was only 12.65. Does that mean the rectifier is shot like the diag suggests? I just want a comfirmation or two before I try to find this part. Is it safe to fish a few days without this working or will it damage something else or leave me stranded? Need some info quick, I would really like to use this thing soon. Thanks in advance guys.
 

Proselect

Petty Officer 1st Class
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Aug 17, 2009
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237
Re: evinrude rectifier

I guess I will just get one and see it it solves the problem.
 

Vic.S

Rear Admiral
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May 4, 2004
Messages
4,720
Re: evinrude rectifier

If you see no rise in volts at the battery when the engine is running then its not charging and a dud rectifier is the most likely.

Easy to test the round non regulated types (See Joe Reeves' instructions on the Engine FAQs board) but not the regulator/ rectifier types.

Worth checking at the red output wire from the rectifier just to be sure there's not a bad connection elsewhere.

You can run without the rectifier and tachometer working but you will not be recharging the battery so after use take it off and recharge it at home. If you leave it without recharging or if you run it too far down too often you will severely reduce its life span.

When you have fitted your new rectifier take great care not to connect the battery the wrong way round. Reversed battery connections = instant death to rectifiers.
 

Proselect

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Re: evinrude rectifier

Ok, I finaly got back to working on the boat. I had emergency back surgery sunday to remove parts of a herniated disc. I felt like doing some walking and moving around today so I installed the new rectifier. The tach now works. I put the volt meter on the battery and with the key on engine off it read about 12.4 volts. When I started up the motor and let it run it climbed up to 12. 9 volts and stayed no higher than that. this was always at idle, or no more than 1000rpm. Is this enough charge to the battery? From the diag sheet I read it said I should be seeing over 13 volts or else the tach won't work and the battery won't charge. Like I said, the tach now works and i am getting 12.9 tops at idle. Can somebody chime in and let me know if this is ok and normal or if I have some other issues. I don't want to get stuck with a dead battery on the lake.
 

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: evinrude rectifier

Sounds better already. After running a while at planing speeds, the voltage will eventually creep up to as high as 16+ with a rectifier only. This is normal.
 

Proselect

Petty Officer 1st Class
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Aug 17, 2009
Messages
237
Re: evinrude rectifier

Thanks for the reply, the insurance that I have this fixed makes me feel a lot better. Anybody else wants to verify this will make me feel even better. Now I just have to get this back healed up so I can hit the water and do some fishing.
 

F_R

Supreme Mariner
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Jul 7, 2006
Messages
28,226
Re: evinrude rectifier

Thanks for the reply, the insurance that I have this fixed makes me feel a lot better. Anybody else wants to verify this will make me feel even better. Now I just have to get this back healed up so I can hit the water and do some fishing.

Your motor is fixed. It takes time to get the battery back up to full charge and higher voltage.

What is amazing is your back surgery!!!! You had disc surgery Sunday and are working on your motor today?? Holy cow, it took me months to recover from mine. In fact, I'm still not 100%. And that was 40 years ago.
 

Joe Reeves

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Feb 24, 2002
Messages
13,262
Re: evinrude rectifier

Agreed, sounds like the unit's charging.

Glad to hear that the back surgery is working out for you. Had back surgery myself back in 1991.... think that surgeon got his medical degree at DisneyLand.

Encountered back problems again a couple months ago, excruciating pain shooting down the front of both legs, different cause. Main nerve that is within vertibrae L4 being squeezed off with something that needs to be drilled out on 09/11/09. Really not looking forward to that at age 77. Hope some of your luck rubs off on me.

Do you have the small three wire rectifier or the overpriced water cooled one?
 

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: evinrude rectifier

Agreed, sounds like the unit's charging.

Glad to hear that the back surgery is working out for you. Had back surgery myself back in 1991.... think that surgeon got his medical degree at DisneyLand.

Encountered back problems again a couple months ago, excruciating pain shooting down the front of both legs, different cause. Main nerve that is within vertibrae L4 being squeezed off with something that needs to be drilled out on 09/11/09. Really not looking forward to that at age 77. Hope some of your luck rubs off on me.

Do you have the small three wire rectifier or the overpriced water cooled one?

I guess proselect has proven that they have better ways of doing it nowadays. They must not be cutting out the bones now like they did on me. Good luck, Joe.
 

Proselect

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Re: evinrude rectifier

I was lucky enough to have the cheaper 3 wire rectifier which was a cheap fix and an easy change.

As for the back surgery, I have been fighting pain here and there for nine years, and I just turned thirty today as a matter of fact. I had been in and out of the chiropractor for the nine years and was always told that it was just stress on my muscles around my lumbar joints. On the 18th of this month something finaly snapped when I lifted a mear 20 pound bag of dog food and couldn't go to work. I then went to the chiro and he couldn't do much about it cuz it was so swollen. I then went to my doc and he ordered x-rays to see if there was anything underlying. If it showed something then they could get the insurance to approve an MRI. The next morning it flared up so bad I had to crawl to the bathroom to pea. I could barely stand to do my business and I crawled back to my room. I then could not get up into bed or lye down on the floor, I was stuck and in so much pain. I finaly conjered up the balls to lunge into bed which moved something that send the worst burning down my leg I never ever want to experience again. We had to call an ambulance to get me to the hospital and they got me an emergency MRI(which in an emergency the insurance will cover). Meanwhile they look over my x-rays from the day before and they said they all looked perfect as could be. I was admitted into the hospital and later tranfered to a different hospital where the the neurosurgion (sp) does his work. The final diagnostic was a herniated disc laying against my spinal cord and pinching off the sciatic nerve to my left leg. This was on the saturday night of the 23rd. My surgion came in and did some bowel and bladder tests and along with my numb left foot decided I needed emergency surgery at 8am sunday morning. I knew it must have been serious. He did a lumbar laminectomy, which consisted of taking out part of the bad disc and I think maybe even a little bone from the spine, but not much. I rolled into my room from recovery at noon that sunday after surgery and I actually walked to the bathroom at 3pm the same day. I was friggin amazed!! I feel better now with a 3 inch incision in my back than I have in 5 years, and I walk pain free. As far as I know I don't have much, if any, nerve damage with my bowel or bladder as they work no different than they have in the past. I do however have tingling and some minor numbness in my left toes and pad of my foot still. I guess nerves will heal themselves if not damaged permanantly, but it could take anywhere from a couple weeks to a couple years for it to go away. I feel blessed that is all that I have as an aftermath side affect. I am truly amazed at what they can do with surgery now and I hope this gives hope to any of you who have showed concern or who may be having to go through this in the future. I still have a couple weeks of not lifting anything more than 10-20lbs and no bending at the waist, but I can deal with that, I get around pretty good. It felt good to get out and tinker with the boat today after being layed up in a hospital and at home for over a week. Now I just cant wait to get the clearance from doc to get out on the water and fish. Sorry for the long story to those just looking for boat info, but I am proud to tell my story to those of you who showed interest. I wish all of you the best of luck with your health. I was niave enough to push off getting treated by second oppinions for years and dealing with a crappy quality of life for too long. My word of advice to any of you is that don't be afraid to get other oppinions and explore all options if you think something in your body is not right. Good luck to all, and if you have any questions feel free to PM me, I will answer what I can. Thanks again to all that helped with my electrical problems, you saved me alot of stress figuring it out. This is a great forum.
 

Proselect

Petty Officer 1st Class
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Re: evinrude rectifier

I guess proselect has proven that they have better ways of doing it nowadays. They must not be cutting out the bones now like they did on me. Good luck, Joe.

My disc that was was taken away was between L4 and L5. He said he did leave part of the disc between the vertebrae so that I still have the cusion and shouldn't have any reocurring problems granted I don't get back into any crazy extreme sports. He also said due to the problem with that disk pobably being bulged for quiite somtime before herniating, that I have two other disks that are degenerative. He said that, again, as long as I don't do any extreme sports, etc to hurt my back, they should be fine the rest of my life. I just need to quit a few things like Ice hockey goalie and snowmobiling. Thats ok with me, if there is no pain I can deal with that. It leaves more time for hunting and fishing.
 

Joe Reeves

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Feb 24, 2002
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13,262
Re: evinrude rectifier

Glad to hear that life is looking up for you. Hard for anyone to believe the pain that will kick out unless you've experienced it..... nasty!

The three wire rectifier test follows just in case you ever need it again.

(Small Rectifier Test)
(J. Reeves)

Remove the rectifier wires from the terminal block. Using a ohm meter, connect the black lead of the ohm meter to the rectifier base (ground), then one by one, connect the red lead of the ohm meter to the yellow, yellow/gray, then the red wire (some rectifiers may also have a fourth yellow/blue wire. If so connect to that also). Now, reverse the ohm meter leads and check those same wires again. You should get a reading in one direction, and none at all in the other direction.

Now, connect the black lead of the ohm meter to the red wire. One by one, connect the red lead of the ohm meter to the yellow, yellow/gray, and if present, the yellow/blue wire. Then reverse the leads, checking the wires again. Once more, you should get a reading in one direction and none in the other.

Note that the reading obtained from the red rectifier wire will be lower then what is obtained from the other wires.

Any deviation from the "Reading", "No Reading" as above indicates a faulty rectifier. Note that a rectifier will not tolerate reverse polarity. Simply touching the battery with the cables in the reverse order or hooking up a battery charger backwards will blow the diodes in the rectifier assy immediately.
 

Proselect

Petty Officer 1st Class
Joined
Aug 17, 2009
Messages
237
Re: evinrude rectifier

Glad to hear that life is looking up for you. Hard for anyone to believe the pain that will kick out unless you've experienced it..... nasty!

The three wire rectifier test follows just in case you ever need it again.

(Small Rectifier Test)
(J. Reeves)

Remove the rectifier wires from the terminal block. Using a ohm meter, connect the black lead of the ohm meter to the rectifier base (ground), then one by one, connect the red lead of the ohm meter to the yellow, yellow/gray, then the red wire (some rectifiers may also have a fourth yellow/blue wire. If so connect to that also). Now, reverse the ohm meter leads and check those same wires again. You should get a reading in one direction, and none at all in the other direction.

Now, connect the black lead of the ohm meter to the red wire. One by one, connect the red lead of the ohm meter to the yellow, yellow/gray, and if present, the yellow/blue wire. Then reverse the leads, checking the wires again. Once more, you should get a reading in one direction and none in the other.

Note that the reading obtained from the red rectifier wire will be lower then what is obtained from the other wires.

Any deviation from the "Reading", "No Reading" as above indicates a faulty rectifier. Note that a rectifier will not tolerate reverse polarity. Simply touching the battery with the cables in the reverse order or hooking up a battery charger backwards will blow the diodes in the rectifier assy immediately.

Yep, that is exactly how I tested the old one and compared it to the new one. I did a search and it was probably from you that that had found the info in the archives. Thanks it helped a lot. I don't remember which wire to wire, but I had o ohms in both directions. It must have been just one bad diode that caused the whole think to go kuput. Thanks for the info again. I saved it into my documents in case this ever happens again. I love this forum, lots of help here. I hope I can help someone someday like I have been helped. thanks again.
 
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