|Created||May 04, 2021|
|Last modified||May 06, 2021|
This combines "3 wire" trailer wiring from separate brake and left/right turn signal wires to "2 wire" where brakes are on the same wire as left or right turn signal. The diodes may or may not be necessary but I couldn't get CircuitLab to do calculations without them.
If brakes are pressed then flashing sequence is inverted so that the activated brake light is suppressed (resulting in a flashing sequence). When brakes are not activated, the normal left/right +12v signals are passed through directly.
The various possible states are:
BRAKE/LEFT/RIGHT signal = left-right light output
[ ABSENT BRAKING, PASS THROUGH LEFT/RIGHT FLASH SIGNAL ]
open/open/open = off-off (no signal/brake lights)
open/closed/open = on-off (left turn light flash on)
open/open/closed = off-on (right turn light flash on)
[ WHILE BRAKING, LEFT OR RIGHT SIGNAL ON WILL SUPPRESS THAT LIGHT ]
closed/open/open = on-on (brake lights ON)
closed/closed/open = off-on (left blinks OFF)
closed/open/closed = on-off (right blinks OFF )
[ HAZARD/WARNING LIGHTS WITH BRAKES ]
closed/closed/closed = off-off (both lights OFF)
closed/open/open = on-on (both lights ON)
[ HAZARD/WARNING LIGHTS WITHOUT BRAKES ]
open/closed/closed = on-on (both lights ON)
open/open/open = on-on (both lights OFF)
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