For 96-04 Tacomas and 96-02 4runner. May work for other Toyotas too. Total cost for me was $30.
This has been tested and does work as simulated. Converts the corner marker lights to function as both park lights and turn signals and eliminates the existing turn signals. This mod must be applied to both sides. The turn signals with this mod are visible from the front and sides.
The bulb is replaced with a 921 as the stock 168/194 is not bright enough for a turn signal. The circuit uses a Bosch style SPDT relay, a 4700uF 25V capacitor, and a diode.
For Tacomas/4runners:
Park+ (green) goes to 87a
Turn+ (green/black on driver side, green/yellow on passenger) goes to 87 and 85
Bulb+ goes to 30
Capacitor is in parallel with relay coil, 85 to 86
86 goes to diode then ground
