Old wiring

[gpfishingdude]

Still trying to get the old 50 horse to charge the battery so I checked the rectifier that I installed last year. It was bad again. While checking the 2 yellow wires from the stator I noticed that one of them had that green corrosion above the terminal end. The wires ran up through a piece of black tubing so I cut it off and what I found was that both wires were corroded and the insulation had fallen off up to about 1 1/2" from the top. I ran each up through a piece of 5/16" shrink tubing to where it covered the bare wires and taped them at the bottom. They are now separated anyway. I tested the stator and it tested ok for resistance. I don't have time to change the rectifier before we go out again but I figure I need a new rectifier and a new stator so that I can get decent yellow wires. I took a picture of another wire that is corroded and marked the end with a piece of white tape to make it easier to tell which one it is. Can you tell me what this wire does? Thanks

 

[gpfishingdude]

Re: Old wiring

I started looking at rectifiers and stators and was wondering if there is anything else that probably should be changed on an old motor like this one to get it into decent shape and functioning properly? I had the carbs rebuilt and have adjusted the idle to where it runs pretty decent now and the water pump works good.

 

[gpfishingdude]

Re: Old wiring

The wire in the picture is from the trigger according to the wiring diagram I found for my motor. So I will change the trigger and the stator while I have the flywheel off. That and the new rectifier and I should have the motor running great and charging the battery too. I plan on installing a voltmeter and tach. after I get it all set up with the new wiring.

 

[gpfishingdude]

Re: Old wiring

I removed the 8 bolts on the inside ring on top of the flywheel and was able to get the flywheel and stator off. But I had to bolt the flywheel back on to have something to hold onto to remove the crankshaft nut that holds the inside hub on. Trigger assemblies are made without big enough clearance hole in the center get them over the flywheel hub. So far this hasn't been that bad of a job yet. Besides parts I bought a set of lifetime warranted set of allen key wrenches and Loctite and a harmonic balancer wheel puller. The rest of the tools are sockets and wrench sets used on general repair work. The timing has to be checked after the parts are replaced and I have an old timing light from when I used to set timing on cars and hope it will work on outboards.

 

[mercurymang]

Re: Old wiring

Does your flywheel have a keyway or an alignment groove on it?

 

[gpfishingdude]

Re: Old wiring

Does your flywheel have a keyway or an alignment groove on it?

The hub in the center that the flywheel bolts to has a keyway and the crankshaft has the key in it. The hub popped off pretty easily with the wheel puller once it broke loose. My wiring diagram is the one on page 2D-4 in the Mercury service manual.

 

[gpfishingdude]

Re: Old wiring

All of the parts came today and I got them installed and prayed that the timing would be close. It started and ran like a cold engine. It only died once before I idled it up a little and after it warmed up I read the voltage. It read 10 on the fifty volt scale so I reved it up and then it read 12. Then I idled it back down and it purred like a kitten. I asked a mechanic earlier this spring if the stator could be bad on it because it wasn't charging the battery. He said it wouldn't run if the stator was bad. I think the running side was good but because of the bad wires the charging side was bad.