# Single Momentary Button to Control Latching Relay

#### NacIK

Joined Apr 6, 2009
3
I am trying to set up a remote start for my 99 Tahoe. I have it mostly figured out and am stuck on one last part. I need to make a circuit that controls a Latching relay with a single momentary push button. I want it to work like an impulse relay, but don't want to fork out $25 for each relay. The relays could either be single coil (polarity change) or dual-coil (separate signals) I believe a 555 timer or a decade counter would work to control the relay, but I am not sure how to hook one up to the circuit. Thanks. Also, a alternate action push button wont work in this case because the circuit is getting multiple pulses from different switches, including a remote control keyfob output. I used on a bypass circuit I made to complement the circuit I am working on, but wont work for the ignition switch. I will post my initial schematics later if needed for explanation. Last edited: #### leftyretro Joined Nov 25, 2008 394 I am trying to set up a remote start for my 99 Tahoe. I have it mostly figured out and am stuck on one last part. I need to make a circuit that controls a Latching relay with a single momentary push button. I want it to work like an impulse relay, but don't want to fork out$25 for each relay. The relays could either be single coil (polarity change) or dual-coil (separate signals) I believe a 555 timer or a decade counter would work to control the relay, but I am not sure how to hook one up to the circuit. Thanks.

Also, a alternate action push button wont work in this case because the circuit is getting multiple pulses from different switches, including a remote control keyfob output. I used on a bypass circuit I made to complement the circuit I am working on, but wont work for the ignition switch. I will post my initial schematics later if needed for explanation.
Simpest method would be to use a DPDT monetary action, center off toggle switch with spring return to center position toggle switch (sounds complicated but it's an available switch). Wire a single coil latching relay's coil terminals to the two common switch terminals. Wire your 12vdc and ground to two of the normally open terminals and finally install two wires in a X pattern between the opposite normally open and normally closed contacts.

Lefty

#### NacIK

Joined Apr 6, 2009
3
That would work, but the circuit has to use momentary buttons that are already installed. Plus, I would like to control this with my remote using only one button. Now if that was a relay and not a switch, that would be perfect.