See My post 4 posts up. The "cut and tape" comments are telling him to disconnect the original stop light wiring. That would have to be done whether he currently has one stoplight or two. Otherwise there would be feedback from the brake light switch that would override the signals. (He posted the diagram in a separate thread that got merged with this one.)

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.