[Shop-talk] Fog and Driving Lights

[DAVID MASSEY]

 What you need is what is called an alternate action relay.  This is a bi-stable relay that will change from OFF to ON or ON to OFF each time the coil is energized.  Like a pull chain light switch.  I remember seeing such a device with an indexing cam that maintained the relay in the state which ever was activated.  A quick look on the internet turned up nothing like that but there are a couple similar-acting relays that use electronics instead.
Here are a couple that work on 12 volts:
https://czh-labs.com/panel-mount-momentary-switch-pulse-signal-control-latching-spdt-relay-module12v-p1068.html?gclid=EAIaIQobChMI6LW6iY-R6QIVUtbACh3tsgrTEAQYDyABEgLjSPD_BwEor https://tinyurl.com/yd3ylfoj
And 
http://innovativecontrolsinc.com/documents.htmlClick on 3050510 Alternate Action Relay module
 
Dave 

 
 
-----Original Message-----
From: Jim Stone via Shop-talk <shop-talk at autox.team.net>
To: Shop Talk <shop-talk at Autox.Team.Net>
Sent: Thu, Apr 30, 2020 3:28 pm
Subject: [Shop-talk] Fog and Driving Lights

I have long wanted to install 1 fog and 1 driving light on my Alpine, and have them wired so that I can light either one or both of them.  There was a period 4-position rotary switch for doing this (off - on1 - on2 - on1&2) and I have one, but it is ugly as sin and I’d like to come up with a more attractive solution.  Ideally, I would like to convert an unnecessary toggle switch space on the dash to a fog/driving light switch.  My hope is to put in a DPDT momentary switch (something like this one, but hopefully I can find something more attractive: https://www.amazon.com/Heavy-Handle-Momentary-Toggle-Switch/dp/B000LFVFA8) and a pair of latching relays.  The tricky part is that I’d need the relays to latch on with the first pulse and turn off with the second.  So, up once to turn on the fog light, down once to turn on the driving light.  Up or down a second time to turn off either light.  Hopefully, that makes sense.

Does anyone know if such a relay exists?  If not, is there a simple circuit that would make a standard relay work as described?

Thanks,
Jim
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