DHCP for only the wireless connected device

[gtsolid]

Good morning sirs,
I have 2 WAN entering in my home. I use both in order to have more bandwitdh.
The first router is the DHCP. I wish to insert the second in the main switch, and let it as DHCP only for wireless connected devices to him.
Currently i'm not reaching the purpose because other device will receive the IP from the second device and not from the first, even if they are connected by cable.
Is the any possibilities to insert a rule?
the routers are vodafone stations, but if i want i can use some TP-Link

 

[SkyNetRising]

It would help, if you could draw diagram of your network setup.
How exactly are you routing 2 wans to your local network? Do you have dual-wan router?
Model names of network devices?

 

[gtsolid]

It would help, if you could draw diagram of your network setup.
How exactly are you routing 2 wans to your local network? Do you have dual-wan router?
Model names of network devices?

Here a diagram:

I have 2 vodafone station revolution. No dual-wan

 

[SkyNetRising]

Normally you want to avoid 2 DHCP services on same network, because you can't guarantee which device will be serviced by which DHCP.

On current setup you could achieve desired effect, if you set static addresses on wired devices (to go through router #1)
and allow DHCP to distribute addresses to wireless deices only (go through router #2).