1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 132Get this manual
07 Attach ohmmeter leads to terminals "C" and "0": If meter shows 400 40 ohms, replace power pack If your test results vary, replace stator
INotel Do not run the engine with power coil leads disconnectedBlocking DiodeRemote Electric Models
If the S.L.OWTM warning system is activated when warning horn receives no oil or low oil signal, test engine harness blocking diode1Disconnect engine harness red connector2Disconnect temperature switch tan leadf313Calibrate ohmmeter on appropriate scaleConnect between engine harness tan lead and engine harness tan pin Note reading4Reverse meter connections or press "polarity" buttonNote reading very high reading (00) in one direction and low reading in the other direction indicates diode is good5Replace engine harness blocking diode if your test results vary6Complete all circuits disconnected during this test