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How to turn on dome light with negative trigger


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modeladave 
Member - Posts: 1
Member spacespace
Joined: May 02, 2016
Location: Ontario, Canada
Posted: May 02, 2016 at 1:28 PM / IP Logged Link to Post Post Reply Quote modeladave
I'm building a car and looking to hook up interior dome lights that go on and off as the doors open or close and want to use relays. The power windows use a set of 4 door contacts, of which some are grounded when the door is closed. When door is open they are all an open circuit. Rather than put in a door switch for the dome lights, I want to tap into a door contact and use it to switch continuity of a negative.
Door Open, no continuity, dome lights go on
Door Closed, continuity, dome lights go off
Its kinda backwards to how relays work I think. Any ideas how to wire this up? I didn't want to run +12V all the time between 85 and 86 terminals of the relay but I'm thinking its the only way. I'm stumped.
Appreciate the help.
Thanks in advance,
-coupster
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: May 19, 2016 at 11:39 AM / IP Logged Link to Post Post Reply Quote howie ll
If those wires are grounded only when door is closed you've got continuity problems with your wiring, also means the power windows would be unusable with a door open!
Either door switches or a micro-switch on the unlock rod going to ground (that's how it's done OEM)
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: May 19, 2016 at 11:40 AM / IP Logged Link to Post Post Reply Quote howie ll
You could also use a PAC Tr1 or DEI 528T as a timer, triggered by ignition off.

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