Dash Cam on/Off From Negative Trigger

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=144415
Printed Date: May 12, 2025 at 10:41 AM

Topic: Dash Cam on/Off From Negative Trigger

Posted By: terbie1
Subject: Dash Cam on/Off From Negative Trigger
Date Posted: May 01, 2018 at 3:17 PM

Hello folks,

I recently installed an Evo one remote start unit on my 2016 Tundra. I also installed a dash cam. I have the dash cam wired directly from the battery with a regular on/off switch right now. I am hoping that I could use the negative trunk trigger from the Evo one to also be able to turn the dash cam on/off. What would I need to add to this circuit to be able to do this? Basically push trunk button on fob once for dash cam on and push it again to turn it off.
Any info. would be greatly appreciated.
Thanks

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Terbie1

Replies:

Posted By: wirewise
Date Posted: May 01, 2018 at 8:56 PM

Relay Diagrams: Latched On/Off Output Using a Single Momentary Negative Pulse - Positive Output

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~wirewise~ Verify all wiring with your meter before making any connections!

Posted By: terbie1
Date Posted: May 02, 2018 at 1:11 PM

Awesome, thank you so much Wirewise!!!

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Terbie1

Posted By: terbie1
Date Posted: May 29, 2018 at 8:01 PM

Thanks for the help!! I went with the 4 relay option with the diodes and it is working beautifully on bench testing. Only thing i’m curious about is that if it is normal to have a constant 12v on the green wire coming off pin 30 to the switch?

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Terbie1

Posted By: the12volt
Date Posted: May 29, 2018 at 8:21 PM

If you used the diagram that wirewise linked to above, it is. The voltage is coming across the coil of the first or fourth relay depending on the latch. You can add diodes across the coils of the first and fourth relays if you like.

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