Turn Headlights on W/ Disarm
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=4065
Printed Date: July 16, 2025 at 9:05 AM
Topic: Turn Headlights on W/ Disarm
Posted By: carguy411
Subject: Turn Headlights on W/ Disarm
Date Posted: September 30, 2002 at 11:25 AM
i was thinking of using my dome light output to turn on my reverse lights (like the new chevy's)and headlights(i have the HID system) in my 2001 Xterra. now im not using the dome light output casue on my truck the dome light goes on with the door locks. i was gonna tack the neg ouput to 2 relays and turn it to pos. 1 for headlights one for the reverse lights. do i have to diode isolate them or will the realays be enought tokeep the cercuits seperate. also where do i get the wires and what colors are they thans for the help and sorry for the long questions. just want to make sure b4 i do anything to be safe
Replies:
Posted By: the12volt
Date Posted: September 30, 2002 at 11:40 AM
Hi Carguy411, there is no need to diode isolate those relays. However, according to the info I have you will need three relays total. One for the reverse lights and two for the headlights. The reverse lights will be a Yellow/Red (+) in the driver's kick panel. The headlights will be Red(+) (driver side) and RED / Blue(+) (passenger side).
Posted By: djfearny2
Date Posted: September 30, 2002 at 11:42 AM
you will have to isolate them with diodes that is you best bet for any reason. better off i dont know what your reverse light wire is but you hedlight wire is red -left red black white 8 pin connector or the head light switch. ------------- Jon
Installer/Help Technician
---coral springs florida---
mecp certification is not always needed. I have it and it has not helped me out at all. my experience out shines it.
Posted By: the12volt
Date Posted: September 30, 2002 at 12:01 PM
You do not have to diode isolate the relays. You will be isolating the headlights and reverse lights with the relays.
Posted By: carguy411
Date Posted: September 30, 2002 at 2:58 PM
ok cool so no relays right. what amp fuse do you recomend. and i need 2 relays for the headlights i cant tap it off of 1 thanks again
Posted By: SnomanF150
Date Posted: September 30, 2002 at 3:06 PM
Diode isolate the headlights? That's one hell of a diode.. Use The relays
-------------
George
David's Car Stereo
Baton Rouge, LA
Posted By: the12volt
Date Posted: September 30, 2002 at 4:19 PM
carguy411, you do want to use relays, it's the diodes djfearny2 was referring to that you do not need.
Posted By: carguy411
Date Posted: September 30, 2002 at 5:35 PM
i meant no diodes sorry about that. and about using 1 relay for the 2 head;ights i cant do that. what about fuse amperage. i think im gonna piggy back the relays thanks
Posted By: the12volt
Date Posted: September 30, 2002 at 5:47 PM
Hi carguy411, no problem, after reading your post again, I fiigured that's what you meant. You can fuse your main power lead from the battery with a fuse equal to that of both headlight fuses, but be sure to fuse each relay separately at the relays with the same value fuse used for each headlight, so if your headlights each have a 15 amp fuse, use a 30 amp main fuse at the battery, then a 15 amp fuse at each relay.
Posted By: carguy411
Date Posted: September 30, 2002 at 11:18 PM
ok kool. i might do it this week some time thanks for all your help
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