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Old 07-05-2015, 10:08 AM   #1
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12V jack on dash

I have a problem with the 12V lighter plug. meter shows 12V when tested. Plug anything into the plug and voltage drops toe <5V. Any idea what can cause this. GPS and other devices will not work.
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Old 07-05-2015, 10:12 AM   #2
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Check the connections both "+" and ground.
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Old 07-05-2015, 12:22 PM   #3
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Quote:
Originally Posted by jacwjames View Post
Check the connections both "+" and ground.
X2 and make certain the socket is not broken internally. Look into it with a flashlight. Is the mounting nut tight? The ground may be through that mechanical connection. If it has spade connectors make certain they are snug fitting.

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Old 07-05-2015, 12:57 PM   #4
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THIS... IS why I do not like meters for testing 12 volt issues.. I much prefer a test lamp.

Corrosion on the contact would be my #1 suspect.. then loose connections or a bad ground (other end of the ground wire)
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Old 07-05-2015, 03:08 PM   #5
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Digital meters does not load the system and will give a false positive. Using a light in connection will load the system and you will get the correct volts. I have been burned many time with this meter.


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Old 07-21-2015, 10:33 PM   #6
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The 12 volt cigarette lighter socket can become unplugged from inside of the dash due to road vibration over time. The back end bracket screws onto the front part you see at the dash. The electric clip can come loose. If there is no power you will have to get back in there and see where it has disconnected.


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Old 07-21-2015, 10:40 PM   #7
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Or, in our case, we have a cat that likes to climb in and under the dash. Kept disconnecting the rear view camera coax since it was just a press fit!.
Luckily the Magna dash is blocked off so we don't have the problem anymore.
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Old 07-22-2015, 08:40 AM   #8
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Or, in our case, we have a cat that likes to climb in and under the dash. Kept disconnecting the rear view camera coax since it was just a press fit!.
Luckily the Magna dash is blocked off so we don't have the problem anymore.
At least the cat survived. Back in the 70's, when I worked in the Telegraph Department of AT&T, I received a call from one of our police station customers. Seems that his teletype machine was dead and so was the new pet rabbit that one of the officers bought for his kids as a Easter gift. The rabbit eat through the power cord. The reporting tech was able to fix the tty but there was no fix for Buggzy.

Happy trails and good mouse hunting to your kitty.

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Old 07-22-2015, 08:53 AM   #9
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Once had a fuse blow coating the inside enough to give a reading on my digital meter.Meter said the fuse was fine. Slide would not work.Visual showed black coating inside.
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Old 07-22-2015, 06:56 PM   #10
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Check ground.

Plug in your device and measure from lighter ring to shiny metal.

Often they ground to mount hole and when loose this happens.
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Old 07-22-2015, 07:18 PM   #11
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Had the exact same issue.... Got a full 12 volts with meter.. When I plugged the gps in..the light would glow faintly.. Brought a new cord same issue... Checked fuse and it was blown.. Checked lighter again 12 volts no load..under load 4-5 volts.. Replaced fuse. Everything worked great... I believe the current was back feeding from somewhere else to the cig lighter circuit..
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