battery confusion? (split charger)

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20 Jan 2009
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West Glamorgan
Country
United Kingdom
Hey everyone,

Recently decided want to fit a lesuire battery to run in car entertainment unit.

Have sourced out a split charger kit and read up how to fit one, only thing is that i'm unsure about the negative of the second battery.

All the instructions that i have read just say to ground it, but surely for a circuit to work it needs to be connected to something more? Explain anyone? Please?
 
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It is connected to something more; the rest of the car!
 
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