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Help please only 8 Volts and Ignition Vk Commodore

Discussion in 'Electrical Wiring / Questions' started by Fingers, Nov 6, 2019.

  1. Fingers

    Fingers New Member

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    Im Stumped, hopefully someone with far more knowledge can help

    I have a VK running a 308 and all was well until last week i tried to start it but only getting clicking sound from the starter

    I checked everything and left it. Came back next day and it started. turned it off straight away
    and tried again but only clicks again.

    When I turn ignition on i see its only reads around 7-8 volts

    I charge the battery checked all the connections, check earth to engine all seem good
    I swapped battery's but no difference

    Still only reads 7-8 volts.
    not enough juice to crank stater only make it click as it hits the flex plate teeth
     
  2. Trevor loves holden.

    Trevor loves holden. Well-Known Member

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    Skylarking likes this.
  3. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    It's common for the ignition switches to burn out in the early girl Commodores as the starter motor solenoid is powered directly via the ignition switch. I suggest upgrading the wiring and putting in a relay so the starter solenoid is powered directly from the battery via a relay which will ensure a good 12v supply to the starter solenoid and save the ignition switch just like all the later model Commodores (and all other modern makes and models) are wired.

    I would also do the same for the headlights, it makes em brighter and stops the headlight switch burning out just like the ignition switch.
     
    Last edited: Nov 11, 2019
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  4. Fingers

    Fingers New Member

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    Using a voltmeter the alternator is charging at 13.8 volts at the battery

    If I test the the wire that goes to the starter where it comes out of the wiring loom (not the main battery feed) it only shows 7volts
    so seems the voltage from ignition is the problem
    I can "jump' start the starter solenoid straight from the battery no problems

    I have looked under the dash and there is an exiting relay attached to the ignition wires.
    Black to 85
    Pink to 30
    Brown to 86
    Red to 87

    Doesnt make any difference if the relay is connected or not

    When the car is at idle the dash voltage gauge show 7-8 volts
    when at 2000rpm is at 12 volts
    if i turn on my headlights the voltage gauge drops to zero

    Unfortunately previous owners have made a bit of a mess so it hard to find out what is going on

    I appreciate all your help and suggestions
     
  5. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    Sounds like a wiring problem for sure. It is best to have the relay in the engine bay and wire the main feed directly from the battery so it takes the load of the main feed wire going into the car. My old VK had a burnt loom due to a short so I ended up having to replace parts of the main +12 feeds going to the fuse box.

    Unfortunately you're going to have to clean up and fix what ever the previous person did.
     
  6. Skylarking

    Skylarking Well-Known Member

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    Just remember that the wires on a VK are probably starting to get somewhat brittle which can cause all sorts of problems. The worst problem can be a short causing a fire which can consume your car.

    Since the wiring seems like a bit of a mess from what you say, it may be worth looking into a new loom with upgrades for starter and headlights as immortality suggested.
     
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