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Craig Chapman

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Posts posted by Craig Chapman

    2003 Cayenne S - Dual battery - Desulphation & Charging

    in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)

    Posted

    On 10/7/2015 at 11:22 AM, Dr Pepper said:

    Thanks for posting this extract Loren - it does fill some gaps in my knowledge but I'm still not clear which, in their words, is the main battery and the backup (2nd) battery - but unless I'm told otherwise, I'll assume for now that the backup (2nd) battery is the one under the spare wheel.

     

    This point is interesting: The backup battery is disconnected from the vehicle electrical system when the engine is switched off

    Based on this statement, it sounds that unless the battery terminals are physically accessed, it's not possible to charge the the backup (2nd) battery except by running the engine - which means my idea of being able to keep both batteries fully charged using the CTEK in maintenance mode is scuppered.

     

    Plan B then:

    For the main battery, I should still be able to desulphate / charge / maintain via the charging terminals in the engine compartment.

    For the backup (2nd) battery, I'll disconnect it (to be safe), desulphate, punch as much charge in it as the CTEK will allow & then see if it'll hold a higher charge for longer periods.

     

    I'll report on how this works out in a few weeks.

    CTEK sell an extension cable that allows you to plug your CTEK charger directly to that rear battery whenever you want to charge it. I have added one to my 2003 CTT

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