[Ericv]

There's a big red wire (I assume the 12volt battery wire) that goes to 87 and the aftermarket start button,

The yellow wire goes to 30 on the relay.

86 on the relay goes to the after market start button.

85 on the relay is a ground.

Today I cleaned all of the ground connections. Replaced the positive battery post with a gold plated post. Replaced all fuses and took a wire brush to the fuse box. I still get a click from the relay when the aftermarket start button is pushed. The connection at the relay for terminal 50 puts out 12.5 volts but when it's measured at the starter, it's 0.1 volts. Hope this helps. Thanks.