First of all, I would like to thank everyone on this forum. I have learned quite a bit since signing up. Now I will get to my questions.<br /><br />To start off with, 1980 Evinrude 50 hp model #E50ELCSR.<br /><br />I have been researching the post to see if I can find the answers to the questions I have. I think I have found most of them but would like to ask for confirmation.<br /><br />1. I think I fried the rectifier when I first rigged my boat. There is a store nearby that has bins full of gauges for $10 each. They have a chart for setting the correct pole on the tach. The chart said to set the tach to 10 pole for this motor. When I first fired up the motor, the tach didn't seem to operate correctly so I changed the pole setting to see if that was the cause. I just didn't have the idle set correctly. From reading posts, it seems that the rectifier can be damaged by doing this. The tach seems to work fine at lower rpm but not at WOT. I canged props to see what would happen to rpm's but it didn't change. The tach reads 3500 at WOT even with a dramatic change (4") in prop pitch. I do have plenty of voltage to the battery while the motor is running. Here are the test results of the rectifier. Also, if the rectifier is bad, can that hurt the tach?<br /><br />MO=Millaohms<br />KO=Kiloohms<br /><br />Yellow/Gray & Ground 0 & 261KO<br />Yellow & Ground 0 & 136 KO<br />Yellow/Blue & Ground 0 & 136KO<br />Red & Yellow/Gray 0 & 0.62MO<br />Red & Yellow 0 & 0.66MO<br />Red & Yellow/Blue 0 & 0.68MO<br /><br />I am assuming the larger KO readings are infinite. It looks like the tests with the red lead shows failure (should be 0 & infinite).<br /><br />2. I have a Clymer manual for the motor and it reccomends a test speed of 4900 rpm when using a test wheel instead of a propeller. Is this the WOT rpm of the motor or just a recommended rpm for testing? I would think the WOT rpm would be 5000-5500.<br /><br />Thanks again & I really appreciate your responses.
