im going to try and get it into the garage to work on it this weekend. anyone ever taken the bed off with an engine crane?
had to go get some of these so i could move my truck around.
i also cleaned up the firewall breakout right in front of the fuse panel, and decoded it. i made a pretty drawing for everyone, hopefully someone will get some use out of it. schematics as well. (this stuff applies to an 86ish s15 truck with a 2.8 and 700r4, if you have a blazer, a 4cylinder, or 88 and newer, a lot of colors and wiring changes, 2nd gen isnt even close)
the colors correspond to the actual wire color in my truck, a few were different from what the schematic shows.
further explanation of each wire
A1-TCC 12V. torque converter control. this is 12V lockup for the TC, it comes from your brake switch, and goes to the tranny.
A2- alternator indicator, brown wire from the alternator to the alternator indicator in the cluster
A3- wiper motor low speed
B1- TCC grnd. goes to the ECM and the ALDL (cruise component) to complete the circuit and put the TC into lockup
B2- 12V ignition switched, from ign. fuse to 510ohm resistor for alternator excitation, also goes to the contacts of the AC relay to power the compressor clutch, and to a random oil pressure switch on the v6 models
B3- wiper motor park switch
C1- +coil, coil power, large pink wire directly from the ignition switch
C2- ecm 12V, ignition switched 12V from ECM1 fuse, main ecm power
D1- Alt. fuse, the large red wire to the alternator with the fusable link, powers most of the interior of the truck
D2- oil pressure, comes from the oil pressure gauge, goes to one of the oil pressure senders
E1-fuel pump relay, this is just a signal wire to the ecm for the fuel pump and to serve as a junction block.
E2- water temp, comes from the water temp gauge, goes to a temp sender
F1-main 12V, large red. goes to the firewall mounted distribution post that the alternator connects to, supplies power to the fuse panel and most of the truck
F2- CEL, 2 wires connect here, a green/wht and a yellow. one goes to the "oil" relay, and the other to a water temp switch, either one will set off the check gauges lamp.
G1- ECM B, constant power to the ecm from the fuse panel
G3- wiper motor park switch, the other one
H1- starter crank, 12V from the ignition switch in crank position to the starter solenoid
H2- ecm crank, crank signal to the ecm
H3- wiper motor high speed
L4- brake pressure switch, comes from the brake lamp, goes to the pressure switch located on the top of the master cylinder
L5- head lights, forgot to see which were high and low beams
M5- head lights, other
N4- front park lights
N6- right front turn signal
O4- windshield washer motor
P6- left front turn signal
1-6 are missing from the schematic, as are a few of the above, i just labeled them for reference. the 1-6 connector harness goes to the rear of the truck
1- left rear turn signal
2- fuel gauge, fuel sender to the gauge
3- reverse lights
4- right rear turn signal
5- fuel pump 12V, internally connects to E1, so it really comes from the fuel pump relay contact
6- running and licence plate lamps