Welcome to the club.
Truck looks solid, there are others here who have done the 4.0 swap into a 86, unsure if there is a write up but there are build threads
good hobby to get into, very interesting how its all done, glad to hear it works with the key. the new key might have to be filed on the sides to round it up a little to work the door
bad cables can cause this, or bad grounds, or a bad starter, whats going on with the door lock cylinder? key just won't turn? could be that the key switch was changed but they didnt change the locks or gummed up lock cylinder
Do you have any power to anything? Ie headlights, does anything work when you turn the key on? Have you tried starting it with the ignition switch off of the column?
left side kick panel is a connector, there is a pdf file on here for electrical manual
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build date 11/16/87
body jm61
*X4
DESCRIPTION NOT AVAILABLE
-SA
Charcoal
AGJ
Driver Assistance Group
APA
Monotone Paint
CBA
Straight Back Bench Seat
CGX
RR Head Restraints Outboard Seating
CKA
Carpets - Floor and Cargo Area
DGW
4-Spd. Automatic aw4 Transmission
ERB
4.0L I6 MPI Engine
GAC
Tinted Glass Windows
GFD
Rear Sliding Window
GSC
Right Black Mirror
JHA
Var Intermittent Windshield Wipers
JJA
Cigar Lighter
K60
STRIPE/BADGE/MOLDING
LMA
Halogen Headlamps
MBJ
Black Powder Coated Front Bumper
MDA
Front License Plate Bracket
NAA
Federal Emissions
PE4
Colorado Red
QE4
Colorado Red
RAB
AM/FM Radio
SBA
Power Steering
SCE
Alcantara Wrapped Steering Wheel
TBB
Full Size Spare Tire
WJD
15X7.0 Styled Steel Wheels
3LX