Voltage spike on vehicle start

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pulltotheright

Member - Posts: 9

Joined: July 30, 2006

Location: Illinois, United States

Posted: December 18, 2015 at 11:45 PM / IP Logged

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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