# How would I add a relay to turn on a new device when the car is on?

**URL:** <https://forums.speedlife.net/t/how-would-i-add-a-relay-to-turn-on-a-new-device-when-the-car-is-on/27716>\
**Category:** NYSpeed Automotive\
**Created:** [April 16, 2007, 11:57am UTC](https://forums.speedlife.net/t/how-would-i-add-a-relay-to-turn-on-a-new-device-when-the-car-is-on/27716 "2007-04-16T11:57:32Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Schema](https://avatars.discourse-cdn.com/v4/letter/s/779978/32.png) [@Schema](https://forums.speedlife.net/u/Schema)\
**Post date:** [April 16, 2007, 12:09pm UTC](https://forums.speedlife.net/t/how-would-i-add-a-relay-to-turn-on-a-new-device-when-the-car-is-on/27716/4 "2007-04-16T12:09:32Z")

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[quote=“Freek,post:2,topic:27716"”]

what year 240?

[/quote]

It’s a 1990. I supposed I posted before I really thought about it, but I should try to find a wiring diagram, see where the wire would have originally originated from within the car, but it looks like the interior was completley stripped at one point (theres a new carpet in there) and for what ever reason, the switch wire was never fed back in to the radio harness.

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