When not in use, the phone continues to stay

It is most likely the low voltage alarm. Suggest connecting when the car is running with no load (110 volts not connected). If the alarm continues turn the unit off and on to reset.

Hope this helps?

Inverter Protection Features
• Short Circuit Protection. The inverter will automatically shut down until short is removed.
• Low Voltage Alarm. An alarm will sound when the voltage from the battery discharges to 10.5 +/- 0.5 volts DC. This is an indication that the battery needs to be recharged.
• Over Voltage Protection. The RED LED Indicator Light will illuminate and the inverter will automatically turn itself off when the input exceeds 16.5 +/- 1 volt DC.
• Under Voltage Protection. The RED LED Indicator Light will illuminate and the inverter will automatically turn itself off when the input is less than 10.0 +/- 0.5 volts DC.
• Overload Protection. The RED LED Indicator Light will illuminate and the inverter will automatically turn itself off when the continuous draw of the equipment being operated exceeds 1200 watts or the surge draw of the equipment exceeds 2400 watts.
• Thermal Protection. The RED LED Indicator Light will illuminate and the inverter will automatically turn itself off when the circuit temperature exceeds 150° F

If it is the flip top ph I opened mine very carefully and find that after time opening and shuting them the wee computer plug comes aprt from the flip part... it is like a male and female plug I couldn't bleve thats all it was after mths of it playing up then stop'n all together it sat in the draw for nearly a year be4,
I pulled it apart and find the problem its from opening and close'n the ph just open it and plug it careflly back in

Your vehicle is exhibiting a parasitic draw on the battery. Something such as a light inside the glove compartment is staying on when the keys are taken from the ignition. To deduce the root cause of the problem using a 12 volt test light, disconnect the negative battery terminal and ground test light to battery terminal post and probe the loose cable end. This should be done with the keys removed from the ignition and all known electrical loads off. If the draw exists your test light should illuminate under these conditions. Next go about the car and search for the source of the draw. Once you have identified and eliminated the draw your test light should stay off.

If this was why you replaced the battery and alternator then you have a draw above normal.

Normal draw will be under 30ma when vehicle locked.

Even a new component can be bad out of the box. Check glove box and trunk illumination first to see they go out when closed.

Next the overhead illumination...is it off when car locked?

Do you have a aftermarket radio? Amps can stay on.

Next check the glow plug harness for power when the engine is off. Possible the glow plug relay is stuck on.

Contrary to popular legend, this vehicle does not have an electric fuel pump. Fuel is pumped by the injection pump on the engine so you don't need to check this..

VW recalled the brake lamp switch...check with VW to see if yours has been done. Have your VIN # handy when you call.

Engine cooling fans 'after-run' relays can stay on too long too. After engine stopped, check to see if cooling fans continue to run. Should shut off after 10 minutes.

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go through your menu options to display settings. there should be a BACKLIGHT option which should allow you to select a a lesser amount of time that the phone stays lit.

Moto RAZR phones are notorious for this. Best thing to do - Get a new phone. Inside of the hinge, there is a sensor that detects if the phone is open or shut. When you open the phone, it still thinks its closed, so the screen stays white, and if im correct the outside display should still work. Pretty much not-fixable unless you know someone who can take it apart and re-position the sensor (will void the warranty)

Best thing to do....Upgrade.

if the screen needs to be wired to the dash light switch it will not change unless the lights are on, if the wire is disconnected it is possible to bypass it making the screen stay bright.
although it would seem more likely that the brightness could be adjusted on the unit settings or by a button on the unit itself

Go to the backlight options and set it for a higher time.

wire issue

Put your phone in "Discovery Mode" Most phones can get there by going to Menu/Settings/Tools/Bluetooth. If you don't have Bluetooth option here, your phone probably doesn't have bluetooth capability. Then, on your bluetooth hold down the big button until the blue light stays. If you have a bluetooth that you flip, make sure it is closed first, press down the button until the light appears and then flip the bluetooth open. that should leave the light on. as the light stays on and your phone on discovery mode they should be able to locate each other.