latching master relay wiring

I would appreciate some verification by more experienced auto wiring people as to the suitability of my wiring diagram. What I have is a master latching solenoid (relay) for the whole car. I want to wire it so that a DPDT momentary(center-off) switch will switch the state, but will do nothing when you try to turn it on if it is already on, or off if it is already off.

Not that I'd recommend a relay for the whole car (unless with redundancy - ii, 2 relays), but why not use an ordinary relay as per:

oldspark wrote: Not that I'd recommend a relay for the whole car (unless with redundancy - ii, 2 relays), but why not use an ordinary relay as per:

Because the latching relay uses no current to maintain its state, so would not drain the battery over time while in storage, and is designed to handle 150+ amp loads.

So why would you want the relay "ON" (ie, car connected) if in storage? Granted, whilst on, an ordinary relay will take say 50mA - 200mA depending, but that is insignificant with the engine running else for short periods (maybe overnight etc). Otherwise for a dual-coil latching relay, why not one push button for on & one for off? PS - IMO there is no need to quote previous replies in full....

Does the latching solenoid require reversing polarity to change states? 

hi, guessing the solenoid in question does require reversing polarity to change states. solenoid of that type is often used in motor homes/coaches as a master disconnect.

I did not fully inspect the diagram, but I did notice that T2 will never see positive voltage.  Both legs of that pole of the switch are at ground.

oldspark wrote: So why would you want the relay "ON" (ie, car connected) if in storage? Otherwise for a dual-coil latching relay, why not one push button for on & one for off?

It would be off for storage. I just don't want it draining power when it is on, but the car is not running. A DPDT switch is essentially the same as two switches, so that is just semantics.

i am an idiot wrote: Does the latching solenoid require reversing polarity to change states?

No, it does not. It simply flips every time it sees voltage, so it does not matter which of the T1/T2 legs gets positive and which gets negative.

OK, after looking at that first diagram for a while it will not work. So I am starting from scratch to make this easier to understand. The following diagram is what I need except for one thing - If the power is on, and you push the switch to "ON", it will turn the power off. I want it do nothing.

The above diagram will change state everytime you push switch to the left.  If it is on, and you push the switch either direction, it will turn off.  If it is off and you push switch to right, it will do nothing.