Reply To: Charging 85 hp 1972–upgrade stator?

[amuller]

Sounds to me as if you have a weak battery. If the only draw is the ignition, and the battery is in good condition and fully charged, it should last for a lot longer than 15-20 minutes.

Does your motor have the breakerless ignition or the double-point ignition?

Check the voltage at the feed to the CDI box, and see at what voltage things start to go to pot. Compare that to the voltage at the battery terminals.

In general, my experience is that old motors/boats tend to have rats nest wiring and there might be a high resistance somewhere.

I expect the higher-amp stator would work on your motor, but if you have checked it for shorts and opens it probably isn’t your problem.

I still don’t have mine sorted, because I’m too distracted with other projects to get to it.