my local protege club had a ground wire install meet today. here are the instructions.
copied and pasted from a post by
niv, one of our members on mpsport.net:
Ground wire Install:
Kit:
? 1 -
8mm x 20mm bolt
? 1 -
8mm washer
? 1 ?
8mm lock washer
? 12 feet of 4 gauge wire
? 10 - 4 gauge terminals (to a 10mm bolt hole)
? 2 ? 4 gauge terminals (to a 5/16
(8mm) bolt hole)
? 1 ? 4 gauge terminal (to whatever bolt fits a 17mm nut)*if you do the
optional right side of engine ground
? 1 battery terminal (11-3501-4 ? $3.42 w/tax @ Canadian Tire)
? 20? of heat shrink tube
? zap straps (to make it nice and neat)
Tools:
? Razor blade (box cutter)
? Wire Crimper
? Wire Snippers
? Ratchet set (well you only need the 10mm, 13mm, 17mm and an extension)
? Wrench
? Heat gun (sure you could use your g/f or wife?s hair dryer, but do you want to
suffer the wrath when you?ve wrecked it?) maybe the stove-top element
would work. I dunno.
? Scissors
How To:
1. Cut wire to needed lengths - you?ll need 6 lengths. (these add up to 11 ?,
so if you want to put that extra ? on one of them I?d do it on #4 or #5 wire.)
a. 1 = 22?
b. 2 = 7?
c. 3 = 23 ?
d. 4 = 33?
e. 5 = 35?
f. 6 = 20?
2. You can use the terminal to decide how much wire to strip off the end of
each length. (I did one and it was just a bit more than a inch)
3. Crimp your 10mm 4gauge terminals to one end of the lengths.
4. Lay out the wires like where they are going to live when you are done, and
attach the Point A?s - the this step is optional but it?ll make your life easier
when you have to put them in for real .
5. You?ll have to cut the factory wires from the terminal ring and put a new
10mm 4 gauge terminal on. (it?s the black wire with the yellow stripe that
disappears under the battery. Cut this as close as you can to the terminal
ring as you?ll need all the wire you can get)
6. Once your wire is lying the way you want, add the rest of the 10mm 4gauge
terminals to the remaining wires except for # 1,4, (5/16th) and 6 (17mm).
Make sure the terminal is lying the way you want as well, then crimp.
7. Put the 5/16th terminals on #1 and #4. and the big one on #6
8. Cut shrink wrap to 1 ? lengths and place over terminals and wire. Now is the
time to use that heat gun!
9. Put the new battery terminal on. (I don?t know if it matters which way you
orient it, but if the terminal attachment point side is toward the left strut
you?ll probably have an easier time attaching #2 wire.
10. Attach the rest of the B points now.
11. For #6 B point ? if you remove the bolt holding the power steering fluid
reservoir, you?ll be able to get at the bolt for #6B easier.
12. Zap strap the wires into place, all nice and pretty.
Note* I didn?t have an alarm on the car at the time of the install, and you are disconnecting the battery so you will reset your ecu and have to reset all your radio stations, as for the alarm I don?t know what you?ll have to do. Turn it off when it starts beeping I suppose.
sorry for the ultra-big picture but it'll help those who are lost.
result?:
idle rpms down and gas mileage up!

butt dyno tells no tales.
EDIT: 5/16th bolts, washers, lock washers should be 8mm.