I would be most grateful if anybody could tell me where on my F150 is the C.H.M stop lamp feed wire joined to the B.P.P switch feed wire?

 

Colin,
From a '97 manual, the two connect at Splice S231. The locator says this splice is on the "Main Harness, near take-out to instrument cluster". That's rather vague! Everything directly controlled by the Brake Switch is labeled circuit #511, and is supposed to be Light Green in color. Looks like about 10 wires come together, including the Brake Switch feed.

 

To Granpa

Invaluable advice! You have excellent knowledge of the F150, Granpa.

Deepest thanks

Colin