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Answer 1 - When Starting Requires a "Jump"There could be several causes, but I suspect that the basic reason is that not enough electrical current is getting to the starter. The addition of another battery in parallel provides that extra "oomph" to turn the starter fast enough to turn the engine over fast enough to function and start.

Some of the possible causes that I can think of right now include:

  • A battery which is unable to provide the amount of current [measured in Amperes (Amps)] which the starter needs to spin the starter and engine fast enough.
  • Corrosion build up on the contact surfaces at any point where connections are made, such as: battery/terminal/cable clamp connections, cable connections at the starter solenoid, connection of the cable at the starter, connections inside the starter such as, brushes to comutator etc.
  • A cable or wire to the starter that has been cut or damaged so that it does not have the same cross-sectional area [diameter] anymore, and therefore resists the flow of current.
  • A worn/defective starter solenoid.
  • A defective starter [as in worn out brushes or "dragging" bearings or bushings which reduce the Rpm of the starter.
Answer 2 - Another Possibility?Maybe a defective ignition coil or high tension lead?
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15y ago

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