On my '72 I used the brown/white wire for the TCS solenoid (solenoid removed by PO). Not sure if your -69 has the same circuit or not. The wire had a disconnect ~12" from the main firewall connector and was routed in the "gutter." The circuit shares a 4 amp fuse with the radio (stock) and has been working fine for several months. The solenoid doesn't pull that much current, but I would recommend protecting the wire with a fuse of some sort since it is a 12 V source.
Good Luck!
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'56 F-100 (w/all GM stuff)
Lookin' for another parts chaser! 
'05 GMC crew cab
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