Who knows about turn signal wiring?

While Dana looks for his diagram, see if this will help you trace down the connections you need to change.

Send the brake light output to the turn signal switch, not directly to the rear lights. It looks like the brake light output should connect to a white wire that leads up the column to the turn signal switch.

Also, the flasher output should connect to a red wire that leads up the column to the turn signal switch.

I don't think your diodes will keep anything from working, but after changing the wires around if you still have problems you can always jumper them temporarily.

TurnSignalSwitch.jpg

18W is the switched brake light power coming in.

18BR and 18 DGN (Dark GreeN) are the outputs to the rear.

18R is the turn signal flasher power coming in

I8P (Pink) is full time hazard flasher power coming in

18T (Tan) and 19LGN (Light Green) are the two front lamps. NOTE there are two wires branching off because one goes out through the bulkhead to the TS lamps, and the other feeds the cluster indicators

H3 20BK (BlacK) is the horn button