![]() The primary output wire for these items is the orange wire, which feeds the stop/taillight fuse, the dome light fuse, and the headlight switch, for the parking and dash cluster lights. The main attachment point feeds the fuses for the items mentioned just above which do not require key on power. Notice the large red wire from the junction. Here's a view of the wiring for the fuse panel. Remember the large red wire is key off power to the fuse panel and it powers the things which do not require the key to be on to operate. Notice it joins three other wires which are the power feeds for the horn relay the, the ignition switch, the headlight switch and the fuse panel.Īll these are full time key off power wires. Next we get into the cab and follow the large red wire up the left side of the diagram. The green and blue wires are the temperature sender and the oil sender wires respectively. Notice the large purple wire for the starter solenoid and the cloth covered wire which is the resistance wire for the ignition coil. ![]() This is the firewall junction block showing the 12 gauge red power wire for the cab. The main junction includes wires from the battery, the alternator, the regulator, and the main cab feed wire to the firewall junction block. Shown below are the points I have mentioned. In addition there is a fusible link from there to a junction on the right fender to protect the key off electrical circuit.įrom the junction a 12 gauge red wire continues across the top of the radiator and down below the left headlight to the main junction of the positive power wires. Positive current electricity begins at the battery Plus post with the large cable to the starter solenoid. I think it would be better to trace the wiring harness from the battery positive post to the fuse box for a better understanding of how the system works.
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