Good Method to Add Wiring For Add-Ons

SpeedThrills said

Success!
I used the spade connector mentioned in post 18 to power the relay (switched 12v), the relay mentioned in post 24, and the fuse block mentioned in post 12. The unswitched 12v came from the starter relay.
I powered the fuel pump, line lock, atf temp gauge, volt gauge, oil pressure idiot light, and tach. All of the gauges and the tach are aftermarket.
Thanks for all the help.
Now to get the dash lights and dome light working…

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This all worked well for a while. Now though, there’s no power at that spade connector I mentioned. The problem seems to have coincided with me welding on the car and forgetting to disconnect the battery first.
Anyhow, said spade connector is in the brake warning light circuit. Been checking continuity, I find it in that circuit. I can’t find the source for that current. Anyone have any ideas? I find continuity under the dash, near where the brake handle was, and in places throughout the harness out to the connector at the brake warning switch. I imagine I could find another source, but I’d like to know why this circuit went dead.