Earth Wire
The battery is in the back of the 944 and there is only one tiny earth wire attached to a point in the boot. Although I had no problems with a bad battery ground, I figured a better ground cannot be a bad thing and may help with the slow crank speed of the starter motor.
I added two additional earth wires and a new earth point to help get a better connection earth from the battery to the car's chassis.
I used spare copper car audio battery connectors as they have lots of options for cables. The middle wire was the original earth wire, and two more were added. The new earth wires are actually eighty-gauge copper-stranded car audio wires for powering amps. The original earth wire looks like a Cooper 4 gauge wire.
I used the rear light earth point for the third earth wire
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