I believed I had a problem with the rectifier on my 1984 115 hp mercury ..... My trouble/problem was when I went to take off in the boat I had no hole shot at all, couldn't get it up on plane. So I did a little reading and tried my hand at some trouble shooting. I started by removing the 2 yellow wires that run from the stator to the rectifier, fired it up and it ran like a bat out of hell!! So ... all proud at myself for figuring out what was wrong with the motor I removed the old one and headed home. When I got home I did a search for testing a mercury outboard rectifier and found this.
1. Place/set your multimeter to the 1000 ohmmeter reading (RX1K, R X 1000, etc). See picture below.
2. Place the RED lead to the ground (G) and place the BLACK lead to A and C alternating. You should show continuity.
3. Place the BLACK lead to the ground (G) and place the RED lead to A and C alternating. You should NOT show continuity.
4. Place the BLACK lead to the terminal (B)) and place the RED lead to A and C alternating. You should show continuity.
5. Place the RED lead to the terminal (B)) and place the BLACK lead to A and C alternating. You should NOT show continuity.
6. If your results differ, then the rectifier should be replaced.
I did the test as show above and my readings where completely opposite of the above test, so figuring I had it all figured out I order and new rectifier.
Well today my new rectifier comes (Sierra 18-5707) and I grab my meter and do the same test and .......... shows results opposite of above prescribed test.
So now I have to ask .... 1. Is above show test incorrect? if its not, did I get a bad (new) rectifier? ... and ... 2. If my rectifier isn't bad and a bought a new one for nothing what else could be wrong with my motor that it runs crappy with the stator wires hooked up to the rectifier, and runs like a champ as soon as there disconnected?
1. Place/set your multimeter to the 1000 ohmmeter reading (RX1K, R X 1000, etc). See picture below.
2. Place the RED lead to the ground (G) and place the BLACK lead to A and C alternating. You should show continuity.
3. Place the BLACK lead to the ground (G) and place the RED lead to A and C alternating. You should NOT show continuity.
4. Place the BLACK lead to the terminal (B)) and place the RED lead to A and C alternating. You should show continuity.
5. Place the RED lead to the terminal (B)) and place the BLACK lead to A and C alternating. You should NOT show continuity.
6. If your results differ, then the rectifier should be replaced.
I did the test as show above and my readings where completely opposite of the above test, so figuring I had it all figured out I order and new rectifier.
Well today my new rectifier comes (Sierra 18-5707) and I grab my meter and do the same test and .......... shows results opposite of above prescribed test.
So now I have to ask .... 1. Is above show test incorrect? if its not, did I get a bad (new) rectifier? ... and ... 2. If my rectifier isn't bad and a bought a new one for nothing what else could be wrong with my motor that it runs crappy with the stator wires hooked up to the rectifier, and runs like a champ as soon as there disconnected?