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Thread: possible alternater failing?

  1. #1
    Regular Member Dane-10's Avatar
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    So the past two times I've startedy car my radio has gone quiet. This is only when starting the car. I have to turn the radio off and on again but works fine after.

    Charge is fine from it to the battery.

    Battery seems to hold charge however i think itbis due car is 06 plate and its on the original battery still.

    Is this sign of alternate failing or nothing to worry about?

    Or even my battery?

    Excuse the spelling. Cant use this phone at all lol

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    Vehicle : vectra c

    Trim : ls

    Engine : 1800 non vvt

    Year : 2004

    Mileage : 136000

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    does the car start all of the time?

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    maybe a diode going in the alternator

  4. #4
    Regular Member Dane-10's Avatar
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    Quote Originally Posted by vectra ste View Post
    does the car start all of the time?
    Starts perfect every single time, There are no other faults the i can see, Its purley the radio/CD, The BC, Sat nav all works fines, It just the Radio the screen stays on and shows hallam FM but no sound unless i turn off and back on.

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    Vehicle : z

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    Put your head unit into "test mode" and keep an eye on the voltage when you're driving. Should be between 14 and 15 volts when driving with no electrics (lights, etc) turned on

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    Regular Member Dane-10's Avatar
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    I've tried many times with the test mode but never see anything extra.

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    Ok, i was been stupid, This morning i got it into the test mode!

    When running (i did a 10 mile drive) it sat at 14.1v - 14.3v.

    a few more thing that may help -

    - Car starts perfect every time.
    - Ive turned my Auto head lights off, as no matter what, they think its dark.
    - When starting the head unit sometimes stop playing sound, Everything will stay on but from speakers can only here a clicking sound every few seconds.
    - Turn HU off and on, works perfect.
    - Everything else works perfectly fine on HU without restarting it, This is only the Radio.
    - Battery Holds charge no problem, and multimeter confirms the 14.1v when running.

    - My phone screen when left plugged in and i start the car stops charging, until i unplug/re plug it - Phone screen stats voltage too high - This is one i found this morning, it only happened on one start though, (i stopped/started the engine several times) So could be a 1 off/cheap USB Charger.

    I will update with more info as/when i get it.

    I am slightly concerned for my battery, It an 06 plate car, and on the Original battery, Should I be looking to replace this asap? (Isn't it every 5 years)

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    Regular Member TonyP2020's Avatar
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    Vehicle : Mokka

    Trim : SE - Orange Rock 's !!

    Engine : 1.7CDTi

    Year : 2014

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    I think the only way to find out is to replace the battery, and also, IMHO, fit the biggest capacity one you can fit in the box.

  9. #9
    Regular Member Dane-10's Avatar
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    Just fitted a new battery, For some odd reason i think it had the wrong battery in, 1.9cdti with a 63ah battery! So now fitted the correct one.

    Bosch S5 74ah £61.99.

    My Test mode when driving around sits at 14.1v - 14.2v and when ignotion is off it obviously drops. Is this correct or am i right in thinking it should be around the 14.4v - 14.5v?

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    About 14.3 when running mate. A cold battery which means bonnet latch open, but no bonnet left upfor a day thn put meter on it you want to see 12.6 if above then all is good

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