24 volts to 12 volts

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novice tech

Member - Posts: 7

Joined: February 02, 2008

Location: Trinidad and Tobago

Posted: March 04, 2008 at 11:34 AM / IP Logged

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

i am an idiot

Platinum - Posts: 13,667

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Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 04, 2008 at 7:20 PM / IP Logged

Does the truck have (2) 12 volt batteries or does it have (3) 8 volt batteries?

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 05, 2008 at 3:46 AM / IP Logged

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.

immobilized

Member - Posts: 5

Joined: September 28, 2006

Location: New Zealand

Posted: March 05, 2008 at 3:57 AM / IP Logged

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.

immobilized security

tedmond

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Joined: January 06, 2007

Location: Ontario, Canada

Posted: March 05, 2008 at 6:33 AM / IP Logged

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.

novice tech

Member - Posts: 7

Joined: February 02, 2008

Location: Trinidad and Tobago

Posted: March 05, 2008 at 7:19 AM / IP Logged

the truck has (2) 12v batteries

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: March 05, 2008 at 10:09 AM / IP Logged

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

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 05, 2008 at 10:55 AM / IP Logged

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.

immobilized

Member - Posts: 5

Joined: September 28, 2006

Location: New Zealand

Posted: March 06, 2008 at 4:37 AM / IP Logged

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

immobilized security

immobilized

Member - Posts: 5

Joined: September 28, 2006

Location: New Zealand

Posted: March 06, 2008 at 4:43 AM / IP Logged

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.

immobilized security

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