87 Merc 90 3cyl stator problem?

[scubarobby]

My 87 merc 90 lost spark when I pulled the starter to change the brushes. I got out my clymer manual to troubleshoot the ignition but the wire colors and configuration dont match my manual.<br /> MY manual says ther should be a red, blue, and two yellows coming from my stator. but I have a green and a green/white and two yellows.<br /> Also my manual shows the red going to my switch box but my swithch box has no wire on the lug labled red. <br /> The green and green/white go through a long thin plastic component then a blue wire exits to my switch box. <br /> I have no continuity between the green and green/white wires of the stator and perfect continuity (no resistance) between the yellows. <br /> Do you think I fried my stator or do you understand why my moters wiring wouldn't match the clymers manual.<br />Thanks for any comments or answers Robby

 

[scubarobby]

Re: 87 Merc 90 3cyl stator problem?

Another clue to the probablem might be that the beep I usually hear when I first turn the key to on is not woking.<br /> My manual says this is a check of the oil injection system.<br /> If the injection system dosnt check out could the motor be inhibiting the spark automatically or is this just a coincidence?

 

[jim dozier]

Re: 87 Merc 90 3cyl stator problem?

Don't overlook the obvious. I assume when you went to work on your starter that you disconnected the battery. Are you certain that all of your connections are good. Sometimes they look good but aren't. Get a voltmeter and start looking around.

 

[scubarobby]

Re: 87 Merc 90 3cyl stator problem?

Yes the negative batery terminal was the first thing I disconected automatically because it is under the same bolt that holds the starter on.<br /> I have checked as many connections as I could find with a meter.<br /> Does any one know if the two yellow wires going to the stator should show 0 ohms (continuity).<br /> Also the other two wires going to the stator have no continuity (green and green/white).<br /> Has any one seenn one of these motors run with no wire conected to the terminal marked red on the switch box (power pack).<br />All these things seem strange. I wonder if bolting the starter on pinched a wire damaging my stator. A lot of wires run under there. I unbolted the starter and did find an abrasion on one of the yellow wires leading to the stator but I hate to replace the stator without a little more to go on. Thanks Robby

 

[dstuard]

Re: 87 Merc 90 3cyl stator problem?

I am not sure but from doing some research it appears that they replaced the old stator with a red one that does not have low speed windings. That would explain the red not being there. The two green wires should read 600-700 ohms. My stator has continuity with the yellow wires. But my boat is still not running so what do I know. The web site I gave you should help. You just have to look at all the stuff on there and find out what it is that you need.

 

[scubarobby]

Re: 87 Merc 90 3cyl stator problem?

Thank you for your help! I just checked and my stator is Red in color. I was wondering were you did your research? Was it on the site you refered to? I dont see were you gave me a site? Am I missing it? My stator dose not read 600-700 ohms so I guess I need a stator. just wondering is your stator red? Thanks Robby

 

[rickdb1boat]

Re: 87 Merc 90 3cyl stator problem?

ALL RED STATORS WILL READ APPROXIMATELY 600-700 OHMS BETWEEN THE WHITE/GREEN AND <br />THE GREEN/WHITE WIRES , (DVA 180V +) Mercury Red stators do not have a low/high speed winding.<br /><br /> From Here

 

[Jerry M.]

Re: 87 Merc 90 3cyl stator problem?

I have a 91 Merc 50. Your motor and mine have been upgraded to the red stator. I bought mine used and have had charging problems because wrong parts were used. Anyway, the green/white, white/ green are ignition leads from the stator that go into a voltage regulator(that oblong box you mentioned) to keep the increased output from the red stator from damaging the switchbox componants. Two yellow from stator go to rectifier/voltage regulator. The buzzer you used to hear is a test of the oil level alarm and or engine temperature warning alarm. I assume you have remote control electric start. If no buzzer when first turning on the ignition, it sounds to me that your not getting power into the wiring harness from the rectifier. There should be a red wire that goes from either the rectifier or the solonoid to a 20 amp fuse on the side in the switch box. Check that for power.<br /><br />I am not a mechanic, just passing on what I've learned from working my own red stator problem<br /><br />Jerry

 

[scubarobby]

Re: 87 Merc 90 3cyl stator problem?

Thanks Jerry I always wondered why I had the oblong box just hanging from my stator. I think the fact that my green/white and white/green wires is reading completely open means I need a stator.<br /> I also guess that the beeping probablem is a coincidental separate problem. My guess here is that the black box that monitors my oil level must be bad.<br /> I did check to see if that 20A fuse was good and whether it had 12V. Yes to both.<br /> There is a purplish wire going to the Oil level black box that has 12v, so I think its not a power probablem to the black box.<br /> I asume that if I touch the two wires that normally go to the oil tank sensor the horn should sound but it dosnt.<br /> This all started when I rebuilt my starter I wonder if somehow I could have surged the system and fried my stator and oil systems black box at the same time. <br /> The only thing that dosnt make sense is that I thought that both quite together, then both worked for a day or two, then both died again. Which souds much more like a bad connection to me.<br />But since I have no continuity through the green wires on my stator it must be bad Right?

 

[srussell28]

Re: 87 Merc 90 3cyl stator problem?

Not a pro here but I now have 2 stators and they both read 690 ohms from the greens, so I would think if you have nothing, it your problem. I got mine from boatfix.com. But the old one was not bad.