accessory wire
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=37808
Printed Date: July 04, 2025 at 5:48 PM
Topic: accessory wire
Posted By: blingo
Subject: accessory wire
Date Posted: August 20, 2004 at 2:39 PM
i am using a relay to turn on an inverter when i turn the key, left or right....my question is if i hook the acc wire up to the relay, will it only have power when the key is in the acc posistion? i need it to have power in the acc posistion, on posisition and starting posistion, so that it doesnt shut off after i leave the acc posistion, or while starting. would it be okay to tap into the accessory wire in a car stereo harness to connect to the relay? id rather not tap into the accessory in the igntion harness, and will i be needing diodes for this setup? thanks
Replies:
Posted By: jaurora
Date Posted: August 20, 2004 at 2:50 PM
Yes the proper ACC wire will work but use the one running to the igniton harnness as this will provide more current rater than overloading the radio acc wire. Depending on what you are hooking up, the current draw may be to high causing the wire to get extremly hot or better yet melt causing serious conditions including possible fire. Jeremy ------------- MECP certified (If it really means anything)
Jeremy
Posted By: blingo
Date Posted: August 20, 2004 at 3:07 PM
Okay I will just tap into the acc wire in the igntion harness then, its just going to be used to turn a relay on, so its not going to be powering anything big, but the relay will be powering a 350watt inverter. should i use a diode just in case on the acc wire from the igntion harness just to be safe?
Posted By: jaurora
Date Posted: August 20, 2004 at 3:21 PM
I would use a fuse insted of a diode. Fuses are simple to replace. A diode will only help if there is reverse voltage.
-------------
MECP certified (If it really means anything)
Jeremy
Posted By: NowYaKnow
Date Posted: August 20, 2004 at 3:33 PM
"i need it to have power in the acc posistion, on posisition and starting posistion, so that it doesnt shut off after i leave the acc posistion, or while starting."
The accessory wire will lose voltage in the start position, and regain voltage when the car is started.
Posted By: blingo
Date Posted: August 20, 2004 at 3:38 PM
what size fuse will be enough? i have a few fuses that were in a cigarette lighter power adapter lying around, will that do the job? or do i need something higher? will the lose in voltage be long enough to open the relay so my inverter will shut down while starting?
Posted By: jaurora
Date Posted: August 20, 2004 at 3:41 PM
Use a 25A
-------------
MECP certified (If it really means anything)
Jeremy
Posted By: blingo
Date Posted: August 20, 2004 at 3:59 PM
okay, thanks
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