Voltage problem with TV
Printed From: the12volt.com
Forum Name: Mobile Video, GPS, and Navigation
Forum Discription: Mobile Video Head Units, DVD Players, LCD and TFT Monitors, Navigation, GPS, PS2, PS3, XBox, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=3693
Printed Date: April 29, 2024 at 2:47 AM
Topic: Voltage problem with TV
Posted By: Rittler2000
Subject: Voltage problem with TV
Date Posted: September 16, 2002 at 1:27 PM
I hooked up my mobile tv to the + wire coming from the ignition switch. When i put the voltmeter on it it reads 21.9 V. I just wanted to know if that is too much Voltage because the tv is rated at 12.6 V ? And will it damage the Tv when i start my car?
Thanx for any help. ------------- Ben
Replies:
Posted By: bberman1
Date Posted: September 16, 2002 at 2:45 PM
What kind of vehicle are you installing this in? You might not be using the correct setting on your voltage meter or it could be broken. Are you sure it’s set to DC volts?
Posted By: Rittler2000
Date Posted: September 17, 2002 at 10:11 AM
Its a 76 cutlass supreme. The multimeter is working right. it is set to dc voltage. Somebody told me that it might be the voltage regulator. But i never heard of that or know where that would be in the car. What do u think? ------------- Ben
Posted By: Philo
Date Posted: September 18, 2002 at 1:15 PM
Dont hook anything expensive to your car until you know why it is reading this high voltage. It will damage your TV
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17 years in the 12 volt industry MECP 1st Class
Posted By: bberman1
Date Posted: September 19, 2002 at 9:49 AM
Have you tested the voltage at the battery? If not do so if the reading is @21 volts than you probably do have a bad voltage regulator. The alternator generates a high AC current the regulator converts it to DC and drops the voltage down to what it should be. The regulator will either be built into the alternator or be external. If you go to your local auto parts store they can tell you if it’s internal or external. Any way I would defiantly replace it. If I can remember external ones are around $20.00 or so and very easy to install. If it’s built into the alternator then you must replace your alternator. Hope this info helps and let me know what happens.
Posted By: Rittler2000
Date Posted: September 19, 2002 at 1:21 PM
Thank you guys. The batery also reads the same voltage. Isn't there a reguator that will plug up in the cgaretlighter for tapeplayers and all other handheld items?
-------------
Ben
Posted By: bberman1
Date Posted: September 20, 2002 at 12:26 AM
Then the problem is the regulator. I would replace immediately it’s not good to run 21 volts thru your cars electrical system it’s only designed for 12-14 volts. After you get a new regulator or alternator (if the regulator is built in) you should see the voltage drop back down.
Posted By: Rittler2000
Date Posted: September 23, 2002 at 8:14 PM
I just wanted to ask if it is better to straight wire a car tv directly to the battery or connect it to the accessory wire. will the tv get to much amps if i wire it to the battery directly? what if i connect a switch in it?
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Ben
Posted By: Philo
Date Posted: October 09, 2002 at 12:44 PM
The battery is usualy best. Most TV's designed for the car do not require much current, but the battery is often the cleanest source of power because it acts much like a filter. You are less likely to get "snow" or interference.
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17 years in the 12 volt industry MECP 1st Class
Posted By: rockfblaz
Date Posted: October 15, 2002 at 6:02 PM
I was just curious. What ground are you touching the negative lead of the multimeter to? Make sure that the ground you're using doesn't have a lower potential than your frame. All the grounds in the vehicle should be the same but it's just food for thought.
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