Before unnecessarily replacing expensive parts, a little bit of trouble shooting with an ohmmeter will help to narrow down what is wrong. I don’t have the specs in front of me at the moment but there are given values for the charge coil and sensor coil. I’ll dig around later and see if I can find them for you.

Another suspicious place to check is inside the Amphenol connector(s) coming from the mag plate. The pins inside can get corroded or get pushed back inside the connector making for a no go situation.

I found this chart over at https://www.outboardignition.com/page40.asp and it gives the values of your mags components. The 583387 trigger (sensor) coil is a common one and it was used from 1980 – 2017 at least on 4.5 thru 60 horse motors.

Look inside your five pin connector and you will see a tiny letter next to each pin. Here’s where a magnifying glass or a loup comes in handy. To test the sensor coils resistance, you’ll have to probe the ‘B’ and ‘C’ terminals to get an ohm reading. Any reading from ‘C’ to ground indicates the coil or leads are shorted to ground and it will need repairs or replacing.

The ‘A’ and ‘D’ terminals are used for testing the charge coils resistance. Any reading from ‘A’ to ground indicates the coil or leads are shorted requiring repair or replacement but you’ve already done that.

There are other tests for the components and the power pack but they require specialised, as in expensive, equipment which we probably don’t have.

It will be interesting to check your old charge coil and if it falls in that 450 – 600 ohm range, you’ll at least have a good spare one. Strange, but the book I’m looking at says it should read 575 ohms +/- 75 while it should read 475 ohms +/- 75 for electric start models. Nope, I don’t know why either.