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Thread: Quick question on TR4 battery

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    Yoda
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    Quick question on TR4 battery

    Need to get a battery for the TR4 BUT the car is at a shop and I've forgotten which terminal is on which side.

    If you are looking at the engine bay from the front (radiator) which side is the positive terminal on?

    I 'think' it is the right hand, drivers side.

    Yes/no?

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    Yoda TR4nut's Avatar
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    Re: Quick question on TR4 battery

    If you haven't converted the ground from positive to negative, the positive side or ground is on the drivers side. Negative then runs down by the carbs to the starter solenoid.

    I think there's room for the terminals to be on either side, just depends if you want the terminals to be close to the hold down bar, or close to the bulkhead.

    Randy
    Randy
    70 TR6 - running
    59 TR3A - slumbering
    64 TR4 - got another one!

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    Yoda
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    Re: Quick question on TR4 battery

    Thanks Randy!

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    Jedi Knight TR4's Avatar
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    Re: Quick question on TR4 battery

    Quote Originally Posted by TR4nut
    If you haven't converted the ground from positive to negative,
    I would add if the previous owner had not converted to negative ground either. My previous owner did the conversion on my car so it is now negative ground.
    Phil
    1964 TR4 CT 36223 L

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    Re: Quick question on TR4 battery

    Both the TR4 (positive ground) and the TR4A (negative) used the same size battery. It was just turned around; posts in front or at the rear. A group 27 (original) size fills the shelf much better than the more common group 24.

    Lou Metelko
    Auburn, Indiana
    65 TR4A

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    Yoda
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    Re: Quick question on TR4 battery

    Thanks guys - appreciate it!

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    Senior Member Stig's Avatar
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    Re: Quick question on TR4 battery

    I have a service bulletin T-65-15 about grounding. It is 3 pages long and starts with:


    General
    Current practice on vehicles of British design is to ground the positive
    terminal of the battery, while other countries have retained, or reverted to,
    the use of negative polarity for the ground circuit.
    With the increasing use of polarity sensitive devices, such as silicon diodes,
    transistors, and electronic components in vehicle electrical equipment, there
    are advantages to be gained from the early adoption of a standardized vehicle
    grounding system, particularly in the service field.
    The reasons which originally prompted the adoption of positive ground on
    British vehicles, although still being valid, are now of less practical
    Importance owing to improvements in electrical design. In the interest of
    standardization most vehicles manufactured in England will in the future change
    over to a negative ground system.
    Two manufacturers have already introduced production models with negative ground
    equipment. These are the David Brown 3 cylinder, 880 implematic tractor, with
    conventional D.C. equipment and the Jaguar 4.2 litre Mk. X and E-types with
    A.C. equipment. This trend will undoubtedly continue until eventually all
    British vehicles have negative ground electrics.

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    Yoda Geo Hahn's Avatar
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    Re: Quick question on TR4 battery

    Quote Originally Posted by Lou Metelko
    A group 27 (original) size fills the shelf much better than the more common group 24...
    Quite so... but the 24 is the one readily available from W-Mart for small money. It doesn't look half bad if stripped of its modern labels and the 3-hole caps replaced with a set of 6 vintage caps.

    For the group 24 I use a couple of wood spacers on each side to keep it from sliding around.


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