have a wire problem involving the harness from cpu to engine compartment. kind of long story to be thorough so please bare with me

picked up 88 le manual hi low a few years ago, body is immaculate, undercarriage doesnt look like its seen dirt ever. 156000 miles, the one

problem was that rats had gotten in to van and ate most of wires behind the airfilter compartment and engining for the guy gave it to me for 300

and i had a van already so i got it. apparently the 88 le 4wd CA is rare or rarer i guess. after two years of religiously searchng for a van to

to match this one and talking to mechanics and toyota i decided that i had to just break down and rebuild wire harness. i worked in car audio

when i was a kid and then high voltage in seattle for a few years, now do alot of sidework on residential, point being i have a decent

understanding of electronics.

So the first dilemma is starting with the toyota factory electrical wiring diagram there is one generic set of schematics that doesnt

differentiate between CA and FED or Manual and Auto, no the later doesnt matter much but i think overdrive runs through cpu.

so secondly after going through about half the wire its seemed that everything matched accept for a few wires that were extra on

the CA car (had a federal doner harness) so i began to wonder if what toyota had told me (that no other harness could even be altered to work)
was true, and i have been working on other elements of the rebuild since. i have since aquired and 87 same except federal, and 88 same

except auto tran and push button and 86 parts van.


so sorry about the boring story but my main questions are:

1. Is it really impossible to frankenstein a wire harness to work?
on matching year harnesses i only saw 4 extra wires on ca model and assume they were for emissions wire layout seemed almost identical.

2. which is the best of these options?

a. remove cpu and harness from federal van? and hope it can pass emissions

b. try and rewire harness from near matching van to work? (except its auto/auto)

c. put the engine from van missing harness 150000 miles into van with bad engine and 380000 miles on it?


if anyone has any input on this, greatly appreciated. main thing is getting one more van on the road by spring so i have two running strong the 3rd can wait till mid summer.
thanks steve