well i wouldn't use 8ga wire! i plan to upgrade my ground and power wires. and i'm going 0ga! 8ga would have to much resistance for my likeing. hell 4 ga might even do the trick!
It would be best if you could connect your grounding cables in series and not parallel...this means that all wires run to the negative terminal of the battery to the following location:
1. Throttle body
2. Intake manifold
3. Ingnition coil
4. Tranny
5. firewall closest to the ECM
6. Engine block
7. Alternator
8. Car Body nearest to the ABS unit
When the car is started, you will be able to have a volt reading of 14.5 to 14.7 volts while the air-con is off.
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