Originally Posted by 87lx
True. Read about the kit though. It has lots of benefits. It's much safer than just putting your battery in the trunk and running a huge hot power cable to the front.
I did read about it. You still have to have a good sized wire feeding the engine and ECU. You protect those wires with fuses or breaker switches. The 8 gauge wire they use is also not big enough to carry the current load required for engine, ECU, electric fans, electric water pump and MSD ignitions used on a lot of Mustangs, so it would only serve for a basic low current draw vehicle system. There is a lot more to know about wiring a vehicle and a lot of these kits are lacking in adequate instructions for various purposes. They assume that the reader knows more than the readers actually do most of the time.
One thing they do that I don't like is to use the frame for the ground circuit from front to back, which does work, but it can also cause problems with EFI cars as the surface on the frame rail rusts and the connection degrades.
I much prefer my way of running the ground cable to ensure adequate grounds throughout the entire system. By utilizing the braided cable and multiple "grounding spots along the frame and bodywork it ensures that adequate grounding is always available at numerous points along the path of the cable.