I have a 1956 Jonson 30HP that came with the wiring harness. I am having issues with the starter not working with the push button. I have followed the attached wiring diagram but some thing is just not right here. The choke solenoid works just fine with it’s push button.
Just to answer the basic first:

Yes, the batt. cables are clean (they are new).
Yes, the battery is fully charged.
Yes, the connections are tight.
The start relay is new.
Yes I checked for continuity from all wires and to ground.
Yes the push buttons tested good.
Yes the starter is good. just had it rebuilt.

What I don’t get is the starter push button has two terminals. One black wire goes to the mercury switch. the other terminal (white) goes the the small terminal on the start relay. My understanding is that power is supplied to the small terminal on the start relay which then actuates the start relay and power is then sent to the starter. The wiring diagram does NOT show power going to the white terminal wire and there is no ground for the junction box shown on the diagram either. BUT if I take my alligator test leads and ground the start relay to the motor itself and then take my other test lead and clamp it on the pos. batt. and then to the small terminal on the start relay, the starter kicks over just fine.

So, what am I doing wrong here? Do I have the wrong wiring diagram? The harness does match the drawing. Seems to me I am missing a ground on the junction box and power to the start relay ?????

Your advice is appreciated. Thank you
Bill

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