very well put JUNG4G, ur car chassis is the ground for all ur electrical components so no u cannot remove that chassis out of the circuit loop, to do so would require alot more wires, which would defeat the purpose entirely, just clean up the connections that are sketchy, and if u want get a battery with slightyly more cca's (cold cranking amps) to make sure u get power thru whatever old wires u do have. to gain power you would need a completely seperate ignition system to get a larger spark into ur engine, grounding ur car is just for basic maintanance, oh and avoid butt connectors, they cause alot of resistance, buy the right connectors, and dont hack the wires u do have.