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Flathead48
I did this install on my '46 Coupe, after cleaning all the grounds and wiring connections, gave minimal improvement. The solenoid you referenced is the starter solenoid, and the yellow wire is connected to the battery side of the solenoid. There is no fuse shown in the yellow wire between the solenoid and the relays, which is not correct. The circuit needs fused protection. On my install, I left all the original disconnected wiring in place, and hid as best as possible, the new wiring and components. I now have nice bright headlights, and even get other cars "flashing" me when I forget to dim.