I need some wiring / electronics help.
I just installed some power running boards. The price was high - but I like the look better than my old steps when they are up and they are much more effective at getting people in my truck when they are down. I am organizing photos for a write up soon.
I want to add this switch:
In one switch position I want the steps to work as they do normally - (open a door and the steps deploy and lights come on, close it and they both reverse)
In the middle position I want the system disabled.
When I put the switch in the third position I want the steps to deploy (+/- lights) whether or not a door is open.
The first two seem easy. I can insert the switch in the power wire from the battery, or in the ground wire (?). That will allow me to turn the switch on and off.
Deploying at the flip of a switch is more problematic. I can think of ways to make it work - but it requires some assumptions on my part:
The current signal to deploy comes from the door ajar wire on each side - if I assume that signal is 12v, and that 12v is what runs to the motors - then I could just wire another power wire from the battery through the switch and directly to the motors.
Unfortunately I have no idea how safe those assumptions are. As currently wired the wiring from the door ajar wire does NOT go directly to the motor, it goes to a control box - from there wiring goes to the motors. Put more plainly, I suspect my assumptions are incorrect, and that my plan could damage the motors, or worse - my truck.
For reference these are the involved circuits in the truck:
And the installation inst for the steps can be found here:
Interestingly, the steps are wired to work with a double cab and mine is an access cab. The wiring that would normally trigger deployment when the rear doors are opened. That isnít hooked up in my truck - because you canít open the AC rear doors without the front doors being opened. Sending a signal (12v?) through the rear door wires to the control module should deploy the steps.
IF I can make that work then I need to find a different way to turn the steps off. If I cut them off at the power source then I canít deploy them at will with the switch in the other position.
Iím sure there are mistakes in my reasoning. I also realize I may not have all the information needed to make these decisions. Hoping someone can help me at least ask the right questions to make this happen.
Thanks in advance.