12v wire?
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Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=127338
Printed Date: May 05, 2025 at 11:12 AM
Topic: 12v wire?
Posted By: juicer
Subject: 12v wire?
Date Posted: May 14, 2011 at 10:01 PM
I am looking for a 12v wire(circuit) to tap into that is hot only when the high beams are on. The tap will be used to switch a relay only and will have no amp draw. The car is an 09 Dodge Challenger SRT-8 with factory HID. Thanks in advance for your assistance.
Replies:
Posted By: howie ll
Date Posted: May 15, 2011 at 10:40 AM
H/lamp relay Unless you have a switching (ie 12V+, ground or multiplex) in the steering column loom
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: syl20rochon
Date Posted: May 15, 2011 at 7:06 PM
I believe that the signal is multiplex at the switch. You see headlights needs a 1.2K resistor to ground to power up. I would go straight to the light bulb to tap my relay using a diode to isolate my relay from the headlight circuit.. FYI, a 30 amp relay's coil draws around 150mA to energies.
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Sylvain Rochon
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Posted By: howie ll
Date Posted: May 16, 2011 at 2:30 AM
It is multiplex, headlight relay output
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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