Quick question for those who have relocated their battery..

[jondee86]

Four wires seems to indicate that the converter will have a coil and a
switching transistor inside. Use of the transistor suggests that the ECU
is using low level signals for switching, meaning that the converter to
ECU wire would be sensitive to EMI. Make sure that this wire is not
bundled with wires that carry switched loads from orther devices.

As suggested above, the earth wire from the converter should be
attached at (or very close to) the point at which the ECU earth wires
are attached to the engine.

Cheers... jondee86