I hooked up a signal stat #105 on my 1965 recently. There were four red wires coming from the signal stat that had to be hooked up to the four wires from the turn signal switch that went to the turn signal element of the lights. The signal stat then had one wire with an in line fuse that had to be hooked up to the fuse box for a continuous 12V supply. Finally, the signal stat had to be grounded to a suitable ground. My switch also had two yellow wires that could be hooked into the brake light switch. These two yellow wires were optional and I chose not to splice them into the brake light switch. If you do so, it keeps the brake lights from coming on when the signal stat is on.
The way the switch works is that it supplies 12V through a flasher to the four wires to the turn signal lights when the signal stat is on. I would describe the arrangement as wiring in parallel. It does not break the connection in the regular turn signal switch. If you turned the turn signal on while the signal stat was on, both would be supplying 12V to the turn signal lights at the same time.
Hope this helps.
Regards,
Steve
New Orleans
