Replace the 12V battery.
If jumping did not work probably the leads did not make full contact; it needs to.
The other car must have its engine running as the dead battery soaks up quite some. Typically a dead 12V battery has one or two cells inverted; they drain out to zero when the other cells are fully charged, and invert as soon as you try to use power from it. When you start feeding it is is almost like shorting it.
When you lad test a battery with an empty cell it will rapidly drop to around 8 Volt (as the empty cell inverts) and stay there (as the other cells are still brimmed).
2011 Insight Elegance
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Accord horn, Waxoyl, HIDs, Green Oil, UltraGauge, LEDs, full upper&partial lower grille block, aero tweeks, plans for several eco mods
Last edited by RedDevil; 11-08-2017 at 03:10 AM.