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Guys, Thanks for the replies !
Tom, You can’t have it both ways, it’s either a magneto or it’s a battery ignition. The electric start 22hp Scott had a magneto with alternator coils under the flywheel to charge the battery, but this Scott 25 engine it just a battery ignition with the coils outside the flywheel ! There are two alternator charging coils under the flywheel that connect to the rectifier with the two yellow wires then a red wire from the rectifier that goes to the hot side of the starter solenoid to charge the battery !
What confuses me is why it says to disconnect one wire from one side of the device on the back of the engine and disconnect one of the alternator wires from the rectifier to start the engine with the battery dead or disconnected ?
Frank, I agree none of my wiring diagrams show this device ! My friend Paul just bought this engine after I persuaded him it would be a great outboard for his 14ft LoneStar ! He has the engine at his house so I can’t pull the mystery part off to see what’s behind it and how it works ? When we get it over to my house and we find out what it does I’ll post another entry about it’s workings ! I have the wiring diagram for the “62” 27.7hp but it is very similar the the 25 and doesn’t show that mystery device either ?
On a battery ignition system, If there is no battery or if the battery is dead, according to what I read on the device and on the rectifier you should be able to start this engine with a rope ! That tells me something is supplying power to the coils to fire it ! And the only thing in the system that can do that is the alternator, and why would it be necessary to pull one of those wires from the rectifier unless the alternator put out too much power and could cause damage to something else in the system ?
The Mystery continues, stay tuned !