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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: bake315 on January 11, 2020, 08:34:22 am
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Howdy folks.
So I found and bought myself yet another truck (this really is a disease), this time a ‘79 K10. Anyway, I’ve been going through the hatchet job that is the current state of its wiring, and I am going to need to rebuild some of the wiring harnesses. I want to buy correctly matched SXL wiring for each part that needs fixing, and I want to make sure that I get the gauges correct. The engine harness running up from the starter was pretty badly butchered. Can anyone tell me the gauge size of each of these wires? I have to restore the fusible links (missing) also.
I know I could always buy a new one for that section ready-made, but $200 just seems a little steep.
As always, I appreciate the help!
bake315
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1979 Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_352_79_1979_Chevrolet_Light_Truck_Wiring_CK_10_30_Only.pdf)
Wire callout code is wire size in (mm)2 wire color - circuit number (insulation type). So, 3 PPL-6 (SXL) on the diagram is the 3 (mm)2 purple wire, circuit #6, using SXL insulation. A metric to AWG wire size conversion table is on page 1; the starter wiring diagram is on page 7.
- Starter solenoid wire (ckt 6) is 12-ga purple
- B+ feed to the firewall junction block (ckt 2B) is 10-ga red
- Ckt 2B is protected by a 6" long, 14-ga fusible link at its starter B+ connection
- B+ charge lead from the alternator (ckt 2G) is 12-ga red
B+ feed to the firewall bulkhead connector (ckt 2J) is 12-ga red
- Ckts 2G & 2J share a single 6" long, 16-ga fusible link at their starter B+ connection
- the battery cable is 2-gauge
Be sure to use high-temperature loom to encase the wires as they route up along the back of the motor.
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Thanks so much, Rich. Exactly what I needed and more. Breaking down the codes and conversions really helps a bunch!
bake315