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Start by counting the big wires going to the buss bar, you should have one to the starter, one to the alt, one to the slave connector and if you have the AUX. power connector behind the pass seat one to there.
EDITED to seem like I am coherent
I have never had my hands on one but the extra post would make sense, there should be a large cable coming out of the engine harness for the 200A, the extra one if it has one can be abandoned (properly)
Here is the trans supplement it has the wire numbers etc...
If your truck had a 400A alt. then you will have two positive cables, one inside the engine harness and one completely independent of the engine harness, you have the 12V breaker and 12V relay for the trans in that wire mix behind the seat, you will need to keep that.
Treat it as a M1097A2, the wiring is as stated a little different.
If the GVWR is 10K then you have the 10K hubs brakes and half shafts, (M1097A1) lucky you as you can get the aftermarket half shafts cheap (with lifetime warranty)
You are lucky to get that truck as most R1s have the 3 speed and...
As far as I know there is no real way to test it off of the starter, the plunger retracts as it pushes the starter drive into the flywheel and at the bottom of its stroke forces the contacts to power the starter motor.
There are several reasons a starter just "drops out" sometimes it is the...
Measure C4 to ground, if the wire is not shorted to ground and you have no 5V reference at C4 then the TCM is bad.
If you see a ground on C4 unplug the TPS and TCM and measure again, you will of course measure the TPS resistance with it plugged in.
You would need to find a 6.2L TCM with the 4l80 as the 6.5L had an ECM and will not work,
Autozone used to carry them but I think that source has dried up.
I would put an oil pressure gauge on it and confirm it had oil pressure before continuing, you can simply screw a gauge into the 90 that the sending unit connects to.
You can still ohm out the circuits, they should read aprox the same and nether should have a ground reference.
Note, I did have a bad TCM not too long ago that gave a code 87
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The only suggestion I have is to use high quality grade 8/10.8 or 12.8 bolts and lock washers, never re-use a bolt that has worked itself loose and locktite certainly would not hurt.