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Charging system Joe Reeves please help

B

bowrider

Member
"I have a 1971 60 hp evinrude

"I have a 1971 60 hp evinrude that you helped me out with several months ago with a points and shift switch blocking diode problem. I hope you can help with this problem because the dealer here told me they never heard of this happening and they don't know what to tell me.
The purple/green stripe that goes to the shift switch has 45 volts on it with the motor running.
The manual shows the staters 2 yellow wires should only have 12 volts on either one of them to ground. From there, there is a diode that has a yellow wire and a yellow/stripe wire that go to the 2 yellow wires from the stater. That diode has a purple/green stripe wire that goes to the electric shift switch. The purple/green stripe wire has 45 volts on it when to motor is running and melted the blocking diode at the switch. Could you tell me what the diode at the stater does and what could be causing the voltage to be so high? I thought it could be the rectifier but it runs to the solenoid then to the ignition switch.

Thanks for your help"
 
"It's impossible for that

"It's impossible for that engine to develop 45 volts. I strongly suspect that you're using a meter that is giving you a false reading. A true 45 volt reading would blow every electronic circuit and component in that engine.

The diode that is sealed within a epoxy mixture of sorts is a shift diode. It's purpose is to supply 12 volts DC to the shift switch when you turn the key to the off position to keep the engine in neutral until the engine shuts down. Without it, as soon as you turned the key off, the engine would lurch forward.

To test the true charging output, temoroarily install a volt meter between the battery terminals, note the voltage with the engine off, then again with it running, OR....

Install a ampmeter between the positive battery cable at the starter solenoid and the positive battery terminal itself. When the engine is off, the meter should be centered. With the engine running, it should register the ampere charge rate."
 
"I will check the charging out

"I will check the charging output like you said this weekend.
My volt meter at the battery was 12 volts, at the ingintion switch was 12 volts but at the shift switch from the stater it was 45 volts. I assumed my meter would be good if it was reading 12 volts at the ingnition switch and the battery. But I will do more checking this weekend.
Thank you for your help Joe"
 
Also 2 blocking diodes at the

Also 2 blocking diodes at the shift switch have melted and burned up and it keeps blowing the 32 volt 20 amp fuse
 
"You mention "stater"

"You mention "stater" above. Do you mean the "stator" that is under the flywheel? If so, I can't think of any wires running from the stator to the ignition switch.

To blow a 32 volt 20 amp fuse, It sounds like there's a dead short in that circuit somewhere.

Do you have a OMC factory wiring diagram that you're working with?"
 
"Joe, I did some checking this

"Joe, I did some checking this weekend and if I disconnect the coil wire so the motor won't start and spin it over the stator wires and the shift diode wire purple/green stripe have 12.3-15.6 volts.
When I hook the coil wire back up and start the engine I then have 45-50 volts on those wires.
When running the motor I put 12 volts from the ignition switch to the green wire from the lower unit at the shift switch so the prop would't turn and the power wire melted. I ohmed out the green and blue wires to the lower unit and the book says they should have 5-7 ohms on them and they have 0 ohms. I guess my next step would be to drop the lower unit and check that. Could this be why I'm reading 45-50 volts when the motor is running at the stator wires or could the high votlage be what is causing problem in the lower unit
I don't know how the stator wires and the purple/green striped wire from the shift diode could have 12-14 volts when spinning the motor over but when running they have 45-50 volts.
Thanks"
 
David.... That's (the

David.... That's (the 45/50v thing) a mystery to me. Do you have the OMC wiring diagram schematic?
 
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