Spread axle dump valve switch help?

That’s definitely a possibility. You can just trace those lines back and will find the dump valve.

You didn’t have any issues with the lift axle, correct?

 

Dump valve will be somewhere around the back axle. Follow the air lines from the back bags to it. It will have two wires,one for power & one for ground.Find the power wire & follow it to the front. Find the wire at the front & hook it to your second plug.

 

Power the plug for what you think is the dump valve Power then go find the actual dump valve and test and see if it has power.

I think you buzzer is buzzing all the time because you have it wired wrong. It needs to be in line after the switch. So when you flip the switch sending Power back there the buzzer comes on.

 

And what you said about blowing fuses, you said you were putting a hot wire in the ground spot? Yeah that will blow a fuse.

I'm pretty good with 12v electric but anytime I'm not sure I draw myself a diagram.

And 12v is easy. You need power and ground. Your trailer is already grounded through your other plug so really you only need power, but it never hurts to have an extra ground wire to truck

On that note did you have your main 7 way unplugged when trying all this? If so you may have not had a ground. Usually your ground will transfer through the fifth wheel plate but not always.

And I'm sorta confused why you showed us a picture of your normal 7 way plug wire diagram?

 

Y

 

Follow it all the way & make sure it is connected where you think it should be. If you do find it hook it to a known good 12v to make sure the dump valve is good.

 

Have the same setup on my Reitnouer, front lift and rear dump. Have both on switches in the cab. I have replaced the dump valve 4 times in the 12 years I've had the trailer. Always been the electric solenoid that died.
I would get to the valve and test it with a 12 v battery to make sure it's working and then start chasing wiring if it's working. You can use a battery from a drill with a couple jumper wires, polarity of wires doesn't matter.