need to switch 12volt constant hot

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autocraf91162

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Joined: September 05, 2008

Location: Tennessee, United States

Posted: September 05, 2008 at 9:44 PM / IP Logged

to power off with ignition of 2004 bmw 7 series

KarTuneMan

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Posted: September 06, 2008 at 12:05 AM / IP Logged

What???

KPierson

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Joined: April 14, 2005

Location: Ohio, United States

Posted: September 06, 2008 at 8:11 AM / IP Logged

As long as the load is less then 30A you can use a standard 30A Bosch style automotive relay.

Connect Pin 85 to ignition source

Connect Pin 86 to ground

Connect Pin 30 to constant 12vdc

Connect Pin 87 to your device that needs constant power only when the ignition is on.

Alternatively, if your power requirement is small enough you can just tap directly in to the main ignition wire of the car.

What exactly are you trying to do?

Kevin Pierson

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need to switch 12volt constant hot

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