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I've had an ongoing problem with two different 8700G's where the radio shuts itself off without my intervention. To make a call or get email I have to manually turn the radio back on. There's no pattern to it. One day it will happen once, the next day five times. T-Mobile already replaced the battery twice and replaced the BB once as well.
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The radio has 2 power feeds, one is wired to battery so it has power all the time for memory and the other power feed is from the ignition circuit so when you turn the ignition on it turns the radio on. You need to determine if the ignition feed is shutting off with the ignition. If the power feed is shutting the power off then there is a problem with the radio. If not then there is a problem in the ignition circuit.
IF the speakers are in the doors then the wiring harness in the door-jam is frayed, and you must cut the rubber to access the wires between the door and the door jam to get at the wires without taking the door apart.
If the sound is continuous, like a long tone humming, it is possible you are on a channel which is not programmed. Try changing your channel knob to a different channel and see if the sound changes.
If the sound is not continous, and only happens upon pressing a button, we are not certain what you are experiencing without seeing the radio first hand.
If it were the battery you would get a low battery beep and then the radio would shut itself down. This can happen from a bad battery or a low battery. If this were the situation, you should check your charger and be certain the light comes on and stays on when the radio is placed on the charger. (Note: your radio should always be turned off when on the charger.) A quick test would be to swap the battery with a known good radio and see if you have the same problem. If so, you know it is not a battery or charging problem.
If none of these items help, send or bring the radio to a Motorola repair shop for a quick analysis.
Most car radios need a code when theyve been disconnected , also some car radios are made to turn off after 20 mins use so that it cant be left on accidently , this is a battery saving idea , it can be bypassed though by rewiring a live connection to the radio rather than a connection through the ignition
Turning off while transmitting is typically a sign of a weak or bad battery. However, since you mention it happens with either battery type, another cause might be the length of time you are depressing the PTT button. These radios have a fail-safe to prevent damaging the final amplifier of the radio. To protect itself the radio will shut down or stop transmitting after the PTT button is held in too long. This being said, I'd check the batteries first. The rechargeable battery pack which came with the radio has a one year life expectancy. A battery can test full when it is weak and might not hold the charge when placed under a load. And usually transmit is the first thing to fail.
Check your wiring. Sounds like you've got a bad ground, or missed a 12v source somewhere. Remember - There is a 12v constant that keeps your radio constantly tied in (so your clock stays correct, etc) and a 12v Ignition/ACC which tells your radio when you've turned the car ON or in ACC mode (which turns the radio on).
If you've mixed the two up, you'd probably get the results you're getting.
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