Originally Posted by captNordy
Sorry the delay, we had our mast
put back on yesterday so had to pivot jobs. I spent some time inside all the wire loom going to the relay under the starter solenoid. There are three wires, I have a white wire (I believe positive from key switch) on one post and two red wires going to the other posts. One red leaves the relay and goes to battery + on large lug of Solenoid with main battery cable. Other red goes to small tab at top of solenoid by itself (I'm assuming the trigger to close the solenoid. As you can see from the pic, the white wire's connection is corroded as all get out.
OK, that makes more sense! Your existing relay uses it's case as the ground wire. And yes, you are correct, the corroded white wire will be going to the key start.
So to use the relay you pictured upthread, you will need to add a ground wire to pin 85. The ground can be some suitable bolt on the engine or you can run the wire to a negative bus.
The other pins should be connected as mentioned earlier.
Pin 86 to positive from key switch (the corroded wire wire). You may need to follow this back into the loom to find a section of wire that is not corroded or run a new wire right back to the key switch in the panel (better long term solution).
Pin 30 to battery + on large lug of solenoid with main battery cable.
pin 87 to the small tab at top of solenoid by itself.
Pin 87a unused.
Hope that helps.