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Voltage spike on vehicle start

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=139972
Printed Date: May 03, 2025 at 9:01 PM


Topic: Voltage spike on vehicle start

Posted By: pulltotheright
Subject: Voltage spike on vehicle start
Date Posted: December 18, 2015 at 11:45 PM

I have a 2011 F150 with a FEDSIG Smart Siren installed to control my warning lights. Occasionally, when starting the vehicle, all the warning lights come on for Approx. 2 seconds and then go off. The main power to the Smart Siren is powered through a relay. Both the relay and the ignition circuit for the siren are powered off of the fuse for the heated seats (delayed power upon start) Some how there is a voltage spike that is powering the relays built in to the smart Siren. Any ideas on how to isolate to prevent the spike?

Thanks,

John


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