It shows a ignition positive to the brake switch and a purple wire to e-13 on the computer. I need to know if that switch is normally off, (what my wiring diagram shows) or normally on and breaks the circuit when you hit the brakes.
It shows a ignition positive to the brake switch and a purple wire to e-13 on the computer. I need to know if that switch is normally off, (what my wiring diagram shows) or normally on and breaks the circuit when you hit the brakes.
This is ALWAYS a confusing question to ANSWER.
The Torque Convert Clutch (TCC) circuit is supplied power when the IGNITION SWITCH IS IN THE "ON" POSITION. When the "BRAKES" are applied the TCC POWER is REMOVED from the TCC circuit, which "UNLOCKS" the TCC.
YOU are 100% correct, the TCC SWITCH is "NORMALLY CLOSED" so when the "BRAKES" are applied (depressing the brake pedal) the TCC SWITCH "OPENS" (removing ignition power from the TCC circuit). The TCC is "OPPOSITE" the way brake lights work.
The Brake Lights are controlled by a "NORMALLY OPEN" switch. The brake light switch is supplied "BATTERY Positive" allowing the brake lights to "ILLUMINATE" when the engine is "OFF" when the "BRAKES" are applied (depressing the brake pedal),
For some , understanding the difference between the TCC and Brake Switch is a "CONFUSING" way of thinking of "ELECTRICAL LOGIC". For some "Removing Power" does not seem like the "LOGICAL" way of doing the things.
Simply stated "Remove Power from the TCC when the brakes are applied" (depressing the brake pedal).
dave w
Last edited by dave w; 08-27-2018 at 03:24 AM.
Makes sense to me, thanks for the input.
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