24 volts to 12 volts
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=102773
Printed Date: May 12, 2024 at 11:52 PM
Topic: 24 volts to 12 volts
Posted By: novice tech
Subject: 24 volts to 12 volts
Date Posted: March 04, 2008 at 11:34 AM
hi i have nissan truck which is 24v and i would like to install a viper 350hv.but i have no idea where to start it terms of converting the 24v on the truck to 12v .thanks
Replies:
Posted By: i am an idiot
Date Posted: March 04, 2008 at 7:20 PM
Does the truck have (2) 12 volt batteries or does it have (3) 8 volt batteries?
Posted By: howie ll
Date Posted: March 05, 2008 at 3:46 AM
You will probably find that like Toyota one battery is only used for starting and that they are wired in parallel whereas they would be wired in series for 24volts. If 24volts must functions could be controlled by a dropper with relays for immob, lights etc. Also check voltage going to radio, that will tell you the answer.
Posted By: immobilized
Date Posted: March 05, 2008 at 3:57 AM
Your asking for a whole lot of trouble trying to put a 12volt alarm into your 24volt truck it will just give you ongoing problems. My advice would to be buy a proper 24volt alarm that will do the job properly.
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immobilized security
Posted By: tedmond
Date Posted: March 05, 2008 at 6:33 AM
i havent seen ANY 24v alarms out there. do you have any companies that you know of? well novice tech, did u use a DMM to find out the voltage? make sure you set it to DC not AC or you will get higher readings than normal.
Posted By: novice tech
Date Posted: March 05, 2008 at 7:19 AM
the truck has (2) 12v batteries
Posted By: KPierson
Date Posted: March 05, 2008 at 10:09 AM
It seems like you should be able to use a voltage regulator to drop the voltage to 12vdc (Find at least a 1A version and use a heat sink). Your outputs should be ok, as they are (-) outputs, just make sure you have 24vdc relays. Of course the easiest solution would be to find a solid 12vdc source in the vehicle. ------------- Kevin Pierson
Posted By: howie ll
Date Posted: March 05, 2008 at 10:55 AM
We are all running around in circles, novicetech, just take a DMM and measure the voltage between one of the permanently fed fuses such as dome light and ground, if it reads 12 volts ignore the fact that you have 2 batteries, one is used as a starting boost, some Pathfinders had that system.
Posted By: immobilized
Date Posted: March 06, 2008 at 4:37 AM
Howie is right I know the older Nissan Safari's were a 24volt system but a lot of these trucks with 2 batteries still only run 12volts. Check your main power feed to your ignition with a multi meter and see what voltage it reads. If it's 12volts then your sweet. If it's 24volts then you will have drama's because most things in your car ie: ignition, starter, light flash and locking will all be 24volt fed and it's a nightmare to reduce all of them
cheers
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immobilized security
Posted By: immobilized
Date Posted: March 06, 2008 at 4:43 AM
Tedmond there are a couple of brands of alarms in new zealand that supply dedicated 24volt alarms and they work really well. fit them to a lot of 24volt trucks and 4x4's with no drama's. the main brand i use over here is a brand called AVS(advanced vehicle security) it's a nz brand.
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immobilized security
Posted By: tedmond
Date Posted: March 06, 2008 at 3:40 PM
thanks for the info will look into it, see you learn something new everyday.
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