With the Uniden UH7700NB How do I tell which is positive and negative on the power input THANK YOU

type into search engine what you need un7700nb service manual

Hi Rob,
It dosen't matter what the serial number is, only the model, in your case UH7700NB.
try: www.uniden.com.au and lookup their site for 2-way radios and follow the links to CB Radios and then to user manuals.
If that fails, try joining yahoo group specialising in your model radio, they will be very helpful.
Cheers
Peter

Have you tried out if the memory is lost when the power is removed ?
Also make sure you put a fuse in the negative lead before you connect it to the ground screw. Why you might ask ?
If someone jump starts your car the wrong way the coaxial cable shield mesh could heat up and set your car on fire .

no sir it can not

Looking at this picture you can see the terminals at the top.
This installation has one speaker hooked up on the right, and the power inputs hooked up on the left.
The inputs will be power on the left, 12 volts positive (V+); a signal wire for to power on the amp that's 12 volts positive too, (V+, It's usually a yellow wire that comes out of the car stereo called To Antenna, or To Amp. and the third connector on the left is a Ground, or 12 volts Negative (12-). Look for the labels V+ and V- to get the power connectors in the right places. (I can't tell from the picture which is which)
On the left side is the Speakers, Each speaker has a positive and negative lead, and the terminals on the amp are labeled Left + and Left - and Right + and Right - .
Align the speaker leads to the terminals (in cars a negative lead usually has a stripe running along the length of it, and a positive has no stripe).

On the other side of the amp are RCA sockets, one red one white. Any low signal can plug into these, from an Ipod to a turntable. Your car stereo, or EQ, will have RCA outputs that can connect to these with an RCA Patch cord, which has plugs on both ends that will fit into the RCA sockets. Whatever signal goes into the RCA inputs is amplified out of the speakers when it works.

Hi Clive,

Simple method is to turn off the radio, take out the batteries, and wait for about 15 minutes or longer. Then replace the batteries (making sure they're fully charged), and turn on the set, all being well, the radio will be reset to factory default status.

I hope this has answered your query.

Cheers,
Peter

hi.
basically, with any charger, the positive (red +ve) wire goes to the positive post.
the negative (black -ve) goes to the negative post.

Remove the 9-volt battery to be tested from the device it is powering.

2 The Readout image by Cinneman from Fotolia.com jQuery(document).ready(function(){ jQuery('#jsArticleStep2 span.image a:first').attr('href','http://i.ehow.com/images/a06/vk/ld/can-test-9v-battery_-1.2-800X800.jpg'); }); Test a battery with an inexpensive voltmeter or battery tester.

Read the instructions of the testing device to ensure an understanding of how to connect the battery to the tester properly.

3

Attach the battery to the testing device according to the manufacturer's instructions, being careful to attach the positive terminal of the battery to the positive input of the testing device, which will be indicated by a "+" or "positive." Attach the negative terminal of the battery to the negative input of the testing device, which will be indicated by a "-" or "negative."

4 battery tester on white image by JoLin from Fotolia.com jQuery(document).ready(function(){ jQuery('#jsArticleStep4 span.image a:first').attr('href','http://i.ehow.com/images/a06/vk/ld/can-test-9v-battery_-1.4-800X800.jpg'); }); Battery tester with metered readout display.

Read the display of the testing device to determine the status of the battery. If the voltage is low, replace the battery with a new one.

The electrical output of a 9-volt battery will decrease slowly until it reaches a level that is no longer adequate to power a 9-volt device. When the output of the battery decreases to 5.5 volts or less, the battery should be replaced as the power output has diminished to a point of imminent failure.

"One has positive and negative input, another positive and negative output (red and black on each)"

Just from your description, it sounds like pos/neg input are the 12 volt pos neg supply for the amp inside the subwoofer. Red is pos, black is neg.

"positive and negative output (red and black on each)"

This sounds like it's used if you want to proved 12 volt pos/neg to another component.

"and a third wire with left input right input positive and negative (blue, red, yellow and black)"

This is for the cables coming from the "subwoofer out" on the amp. This is 4 wires altogether -- correct?

If you have a digital tester just select DC voltage then connect the positive leads of the digital tester to any of the wire coming out of the 18V adapter (WARNING do not connect to the wire connected to the main) and then the other lead of the digital tester which is the negative connected to the other wire of the 18V adaptor. If in the screen of the digital adapter reads a negative value, then it indicates that the other wire is the negative and the other is positive. Otherwise if the tester reads a positive value then your tester's leads have got the right connection.
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