We all know that rx-7s of all years suffer various electrical issues and hesitations, largely attributed to poor grounding and charging. ON top of this, all cars 10+ years old develop charging issues due to age and corrosion, and poor connections. Because of this, many seek to rewire their charging/ground system. There are ground kits sold on ebay, but you can hardly expect quality from a 20 dollar wiring kit, when quality 4 gauge wire alone sells for $2.50/foot or more.

For time, fitment, and availability reasons, I choose to make my own kits. I do so from high grade 4 gauge power wire, obtained at most any local stereo installation shop. I also use the appropriate ring terminals, crimped in a vise and soldered well. I also use new battery terminals, and clean the battery posts well, as well as all connections made with the new wires.

I make the following connections (in addition to the stock wires) which vary by car: This gives clean, high voltage signal to the starter, alternator, and engine wiring harness/ecu.

••		battery + terminal to alternator + post
••		battery + terminal to starter + post
••		battery ­ terminal to chassis (bare metal) at strut tower
••		battery ­ terminal to top of block (where wiring harness bolts down)
••		ground to alternator body
••		ground to starter body

Though ground wire kits are often sold on ebay and elsewhere, sometimes quite cheaply, these only address half of a charging/voltage system, leaving the positive wires unaccounted for. It’s just as easy to have a bad wire or poor connection on a positive lead, as it is on a ground. Though it’s often asked and stated that this will increase horsepower, response, and efficiency, this will only happen if you had a problem to begin with.