Large positive wire from the main lug terminal (copper plated stud) to the battery positive terminal.
Ground wire from one of the 2 long bolts for the starter at the bell housing connection point, direct to chassis ground at the bolt location just below the factory battery location.
The bolt used to ground the wire at the chassis should have no plating, and should have little depressions in the threads that self clean/tap the hole as it goes into the threads. Special bolts from all the rest. I have one that is labelled "E" on the head, for earthing type bolt. Not sure if it is original to the turbo or if I grabbed ti from the 1992 Colt, or some other car along the way. Technically, any car that uses a ground wire setup this way, is a source for a new bolt to use.
Solenoid feed comes from the starter ignition switch and is usually a black wire/yellow solid tracer to the single push pin connection on the bendix.
http://www.lilevo.com/mirage/89%20Colt% ... 0TURBO.pdf
Page 82/328 or 8-56 if the PDF page reference is off for some reason.