Maybe overthinking this but here is scenario: Have a Radio headset that need to be on charge while in truck, charges off battery with no issues. When the Key is turned to accesory we need a circuit that kills the 12 volt power to that charger. The reason being is this is a Bluetooth radio that powers up while charging (Factory Forced) and we do not want it auto connecting to radio.
We have currently tried to accomplish this with a RL45 relay that when it senses voltage on from the ACC key it kills the 87A output. What I am seeing though is that triggering off the ACC Key is not consistent as when the truck is started that relay might have been off and on a few cycles. Trying to figure out some type of timer circuit I am thinking that can sense loss of 12 volt from the 87A relay terminal and keep it off for x number of seconds to give the headset time to power down and not auto connect. Open to any suggestions on how to cleanly do this is multiple trucks.
We have currently tried to accomplish this with a RL45 relay that when it senses voltage on from the ACC key it kills the 87A output. What I am seeing though is that triggering off the ACC Key is not consistent as when the truck is started that relay might have been off and on a few cycles. Trying to figure out some type of timer circuit I am thinking that can sense loss of 12 volt from the 87A relay terminal and keep it off for x number of seconds to give the headset time to power down and not auto connect. Open to any suggestions on how to cleanly do this is multiple trucks.