Apparently the starter relay is working OK. It does need a good ground from the “Neutral Safety Switch” which is mounted on the tranny. As the switch and wire are exposed to the elements, you may not be getting a good ground with the selector in Park or Neutral. The ignition switch can be tested by observing Voltage to ground at the ST tab on the relay. You should get 12 Volts+ when the key is in the “Start” position. The neutral safety switch and its connection can be tested by jumpering the GRD tab on the relay to a good ground and then try the starter switch. Be sure the tranny is in Park when you do this so that your Brute does not motor off on its own. I think the Neutral Safety Switches are common items at the auto parts store.
On our ‘64K, the wire going down to the tranny starts in the loom running across the firewall and more or less in the center behind the engine. Two wires come out of the loom there—one to the low oil pressure switch and the other to the Neutral Safety Switch.
All you Dads: Happy Father’s Day. I hope your love for 300’s has been passed on to your kids.
I had that problem.
In my case it was the ignition switch.
Posted by: "Rich Barber" <c300@xxxxxxx>
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