Proper Mercury stator resistance

[Premium2000]

I have a 1988 100HP Mercury O/B which I am trying to diagnose an ignition problem. The engine just stopped one day and I found that all four cylinders do not have any spark (via timing light). I checked all the connections along the wiring harness, pulled and checked the black/yellow wire coming from the ignition and tilt switches and it is working properly. I even pulled this wire from the ignition box but still no spark.<br /><br />The resistance check for the trigger curcuits are within specs. However, when I checked the stator resistance it came out to be 650 ohms. An older service mannual that I have indicates that the resistance should be around 6,800 ohms. But I'm not sure that this spec is correct for the stator in my engine. The specific stator that I have is PN 398-832075-A3. It has one set of yellow wires and one set of green/white wires. FYI, this stator is about 6 years old.<br /><br />Before I go out and spend $200-$300 for new stator I'm looking for some advice on whether I'm on the right track. Any thoughts? Also if I do need to replace the stator, are there any good internet sources for used units? <br /><br />There is a Mercury stator being offered on Ebay which looks identical to mine but but the PN is slightly different 298-832075-A11, would this work?<br /><br />Thanks for any help that you can give me!!

 

[rickdb1boat]

Re: Proper Mercury stator resistance

P2k <br /><br />"ALL RED STATORS WILL READ APPROXIMATELY 600-700 OHMS BETWEEN THE WHITE/GREEN AND <br />THE GREEN/WHITE WIRES" , (DVA 180V +) <br /> <br /><br />From Here

 

[Premium2000]

Re: Proper Mercury stator resistance

Thanks, that saved me a few dollars and a lot of frustration! I still don't know what is causing the loss of spark on all four cylinders but it must not be the stator.<br /><br />Larry

 

[Premium2000]

Re: Proper Mercury stator resistance

I put the stator back in place and decided to test the output voltage while cranking the engine (new fully charged battery). I used a regular volt-amp meter measuring across the set of green/white wires. While I hoped for 180 volts I only got 102 VAC. I'm assuming this is peak to peak and not RMS but even if RMS that converts to only 141V Pk-PK.<br /><br />I'm I missing something? If the reading is correct, does the mean that the stator is bad even though the resistance reading is within the expected range?<br /><br />Thanks again to anyone who can advise me!<br /><br />Larry

 

[Mufasa]

Re: Proper Mercury stator resistance

I would not consider that meter a good tool for that voltage measurement. It requires a peak volt meter or peak volt adapter for your multi-meter. The ohms tests gives you some information put will sometimes lead you astray. Stick to the voltage values and get the adapter before you buy expensive parts that you don't need.