I have wanted a right turn cornering light for my 1991 Mustang for several years.
Cadillacs have similar lights for both left and right turns as standard
equipment. In my case the light illuminates an area I am turning into
at night that is not adequately illuminated by the
headlights. The lamps are
mounted in two holes in the right front plastic bumper shroud.Light
is switched on when the right turn signal is activated. The pulse from the turn
signal goes to a relay-capacitor-transistor circuit with a time constant of
about 3 seconds so that the light stays on continuously during the turn and
then extinguishes about 3 seconds after the turn signal stops.
I decided to use a somewhat unconventional scheme to wire and
control the lights. The car is 30 years old and has lived in the
Phoenix, Arizona area for as long. The heat in this locale tends to
make the plastic electrical connectors brittle, and although I have the
car's electrical schematics, I decided to not disturb these old
connectors (and their plastic trim coverings) to make taps into the
appropriate electrical wires. Instead, I sourced the needed signals
directly from the headlight and turn lamp themselves, but then to
work properly, these signals have to be processed by a custom
made controller.
The controller is very simple and was made from parts on hand . Key parts were:
Diodes:
BOJACK Schottky
diodes, 60 V, 5A (P/N: SR560 (test forward V as 0.215; these can also be general purpose diodes)
Electromagnetic
power relay 12VDC, 5A contacts, DPDT with DIN socket, 164 ohm coil
(YJ2N-GS-8-12VDC) APIELE X001Z5TU5B
Capacitor/resistor:
I used 4300 mF and 680 ohms to get the right time constant for the Darlington
The
parts were mounted on a piece of Masonite. The four terminal posts
were made from segments of plastic pipe, 1/2" coupling nuts (10-24) and
epoxy fill. At the bottom is a 6 position barrier terminal strip. The whole thing fits into an aluminum project box with provisions to the keep the board in place and properly insulated.
The box that houses the controller board is a BUD Industries CU-3008-A Aluminum Electronics Minibox, 7" Length x 5" Width x
3" Height, Natural Finish
( https://www.amazon.com/gp/product/B005T7T0Y6/ ref=ox_sc_act_title_1 ) The 3" height was easily cut down to 2”so that it would fit under the front seat.
The
cornering lamps shown below the right front bumper are Ambrother LED
Pods Light Bar 4-Inch 120-Watt lamps (12,000 lumens each). Each
consumes about 1.8 amps @ 12.6 VDC (23 watts each). Both lamps
light up during a signaled right turn if the headlights are on.
They go off about 3 seconds after the turn signal resets. https://www.amazon.com/gp/product/ B07KB56QG7/ref=ox_sc_act_title_1