Help with Charging and Tach

[gigreg2]

I have a 1999 Johnson 200HP OceanPro Motor. Last Friday While out My Tach stopped workign and my batteries stopped charging. Read a bunch of posts here and did some trouble shooting and decided that the rectifier/regulator needed replacing. WEll I went out and bought one p/n 586271 and replaced it. The part was missing a purple wire but I read on thsi forum that the purple wire was not needed because it was redundant so went ahead with the installation. Everything got back back to gether last night and I fired up the motor. Again no tach and no charging. Does anyoen have any suggestions at what I should look at next?<br /><br />Could it be a bad stator?<br /><br />One other interesting piece of info. The regulator I bought was semifinished. The posts were not tapped and the holes that hold the connector clamp were not tapped. I had to tapp them. Do think I got a faulty new regulator.<br /><br />Please help! Im a little bummed out about this.

 

[angus63]

Re: Help with Charging and Tach

Welcome,<br />The service manual has a series of procedures to verify ignition components are functioning. You can check the input from the stator to the rectifier and the rectifier output to see if it's the culprit. Manuals can be found on ebay and theoutboardwizard.com websites. Get the factory (OMC/BRP)manual. Check the obvious as well (wiring,fuses,terminals,batteries,....).<br />Good luck

 

[gigreg2]

Re: Help with Charging and Tach

I did go thru the procedures in the manual and it pointed straight to the regulator. Ill try them again it was 11:30 last night by the time we got everything back together and fired it up and found it it still wasn't working. Got depressed and went home. <br /><br />I think im going to pull the boat out of the water this weekend and brign it hoem to work on it. it makes it more of a challenge hanging over the transom at the dock!

 

[wilde1j]

Re: Help with Charging and Tach

Did you measure AC from stator to the reg/rec? No AC, no charging.

 

[gigreg2]

Re: Help with Charging and Tach

I have not measured AC voltage yet. <br /><br />Could a bad stator cause the no tach and no charging also? Everything I have read says go the rectifier. Im just stumped.<br /><br />And also is it a a pain to pull off the flywheel to get at the stator?

 

[Xcusme]

Re: Help with Charging and Tach

Hmmm, as WildeOne mentioned...you have to have A/C output FROM the stator To the rectifier before you'll have a working tach and battery charging. <br /><br />The stator produces A/C voltage.<br />The rectifier converts this A/C voltage into DC voltage.<br /><br />Is it a pain to pull the flywheel? If you don't have the right tool, yes,it can be a challenge. Find a harmonic balancer puller, it should be a snap.

 

[gigreg2]

Re: Help with Charging and Tach

Do you need a special socket to pull the flywheel. I know its 1 7/16 but it looks like i will need a thin walled socket to get in there.

 

[angus63]

Re: Help with Charging and Tach

Yup<br />Purchase a cheapo socket and grind it a bit to get in there. You can use an ordinary ac volt meter to check the input to the rectifier from the stator. Check the stator resistance if there's an issue. Also check the flywheel magnets.<br />Good luck

 

[ezeke]

Re: Help with Charging and Tach

The motor has to be running to generate AC.<br /><br />If the motor is running, it is generating AC, or it would not be running.<br /><br />Where are we going here?

 

[Xcusme]

Re: Help with Charging and Tach

Two different,seperate sets of coils generating different voltages, one generates voltage that gets rectified to charge the battery. The other generates voltage to power the ignition.

 

[gigreg2]

Re: Help with Charging and Tach

Okay I pulled the stator my flywheel came off pretty easy surprisingly. Before I pulled the stator we checked AC voltage coming out of the yellow wires going to the rectifier. Got 0 Volts with motor running. Did the resistance check ont eh stator. ~800 ohms on the two charge coils within spec, ~90 ohms on the power coil which is in spec I beleive. And got an open on the 2 yellow wires goign to the rectifier. i beleive this should be 0.16 ohms. I feel like Im barkign up the rigth tree here thinkign the stator is bad but I need some reassurance.<br /><br />PS I have not put in the new stator yet because its currently on order I should have it on Wednesday.

 

[angus63]

Re: Help with Charging and Tach

Sounds like the stator is the issue to me.

 

[Xcusme]

Re: Help with Charging and Tach

Hmmm, I don't know what the resistance reading should be for your stator, you say you got approx. 800 ohms. This indicates that the stator coils are, at least NOT open (broken coil windings), but the resistance values seems very high. Just for grins,meter each stator line to ground, get any resistance readings??

 

[Seasport]

Re: Help with Charging and Tach

You should measure a very low resistance (like 0.2 ohms) between the yellow & yellow/gray wires (the alternator coil). Looks like you have an open circuit there.

 

[gigreg2]

Re: Help with Charging and Tach

The manual says 850 ohms +/- 85 ohms on the charge coils. 95 ohms on the power coil and 0.16 phms on the yellow and yellow/grey wires. Im going to borrow a better multimeter today just to double check that I do not have the .16 ohms on the yellow wires. Im just not 100% certain that my multimeter is capable of reading that low.

 

[Seasport]

Re: Help with Charging and Tach

Touch the leads of the multimeter together and you'll see it read close to zero ohms. You probably won't be able to discriminate between doing this (i.e. a dead short) and 0.16 ohms - will look much the same. However, I thought you said that you had an open circuit between the yellow wires. That's infinite ohms and the meter won't register any resistance (not sure if you're using an analogue or digital meter here).

 

[jhebert]

Re: Help with Charging and Tach

From the resistance reading you report, it sounds like the winding of the stator associated with the charging circuit has failed. <br /><br />I try to describe in detail how this permanent magnet alternator works in<br /><br /> http://continuouswave.com/whaler/reference/PMA.html <br /><br />You may find reading this article will help you understand how the stator and rectifier operate, and how they affect the tachometer operation.

 

[gigreg2]

Re: Help with Charging and Tach

The article was interesting thanks. Well the new stator arrived yesterday. i will pick it up today at lunch and if it ever stops raining up here I will get it changed!! Hopefully when i put the multimeter on the new one i get 0.16 ohms on the charging circuit

 

[Basscat 1]

Re: Help with Charging and Tach

jhebert, that is an interesting article. <br />I once asked a question on here concerning the exact details on how a tach receives its pulse and why OMC tachs had different tach settings on the back of them if they were all set on 6P. It seems I got shot down for questioning somebody, but after reading your article, I just may have been right all along.<br /><br />BTW, just posting this link so I can read it. It was sent to me in an email, but wont open.<br /> iboat web page

 

[gigreg2]

Re: Help with Charging and Tach

Just wanted to thank everyone for their help. I replaced the stator on Friday Evening and the motor runs great. Excellent charging and my tach works!!! Only $600 later (includes new stator and Rectifier/Regulator assembly). But its cheaper then a new motor right!!! Can't wait to get out there and start catchign fish again. Well anyways Thank you all!!!