I Might Just Know What I'm Talking About
Join Date: Dec 2006
Location: S. CA
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Boy....am I the guy you want to talk to..........
I finished a SBC swap into my 84 CJ about a year ago....
First off....who ever chopped the wiring harness did not know what they were doing.
The wiring is actually a lot easier than it seems.
Go to a junk yard and pull the wiring harness from a donor veh....92-94 is just about the same...the only thing different is the VSS (Vehicle Speed Sensor). You want the harness all the way to the computer. There are also a few wires that go to the fuse block inside the engine bay. You only need a couple of those wires......mine harness had been cut there so it was the biggest problem for me to trace out.
You will end up pulling out your existing computer harness and computer. There will also be a couple other wires in your chassis harness (left side under the brake MC...fuse block).
You will want the FSM for you jeep and the FSM for the donor truck.
The new harness will fit nicely through the hole of the old computer (after you enlarge it a little) and the new computer in place of the old one.
In reality, there are only about a dozen wires that you have to hook up....about 6 to get it running...the rest or for the OBDI connector, CEL, etc.
Last thing....the computer and harness also include the wiring for the transmission....the donor veh you get the harness from has to be the same transmission type....if you are running an auto you will need the harness from a truck with an auto......hopefully you are going auto...the 4L60 is a great tranny....
84 CJ7, SOA, 5.7LTBI, 4L60E, 35"x12.5, 4.10 gears, F/Det, R/ARB, Full Roll Cage,
D44 Flat top in progress...
Link to my Frame up Restore