I'm not so smart when it comes to electrical things, so please forgive my ignorance. Here's what I am trying to do. I have a quad axle dump truck, I'm trying to have the drop axles automatically come up when put into reverse. The drops are raised and lowered via 2, 12 volt solenoid valves. I currently have the solenoids 'powered' to lift them and when they are lowered, the current is removed via 2 toggle switches in the cab of the truck. I ran a wire from the back up beeper to one of the solenoids and it now activates the solenoid and lifts the axle when the truck is shifted into reverse, but when I power the solenoid in the cab to raise the drop axles when empty, the back up beeper is being powered and always is beeping. I am thinking I need some sort of diode with one lead in and two out, so no power goes to the back up beeper, so I can run one to each solenoid lift valve, but not sure. What do i need to fix this problem? Thanks in advance.