Caterpillar 385B Wiring Harness — All 3 Sections
The Caterpillar 385B uses 3 separate harness sections that ECS builds. They are not interchangeable: the part number on your old loom decides which one you need. Below they are grouped by where each section sits on the machine, with the part numbers and the symptoms that point to each group.
Which section do I actually need?
Start from the fault, not from the part name. Find the symptom the operator reports, then open that group.
| Section | First symptom to look for | Group |
|---|---|---|
| Engine Harness | Intermittent misfire or a dead cylinder | Engine Harness group |
| Lighting Harness | One side of the machine dark | Lighting Harness group |
| Boom Harness | Boom lights dead | Boom Harness group |
Engine Harness 1 part
It runs inside the engine compartment, clipped along the block and head and routed past the front cover. On most machines it is the longest harness on the engine side and the one closest to exhaust heat.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 145-3850 | Engine Wiring Harness | $536.00 | In stock |
Lighting Harness 1 part
It runs from the fuse box out to the front, rear and boom lights, exposed to weather and wash-down.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 170-6990 | Boom Light Wiring Harness | $119.00 | In stock |
Boom Harness 1 part
It runs along the boom to the boom-mounted lights and switches, flexing at the boom pivot every cycle.
| Part # | Description | Price | Stock |
|---|---|---|---|
| 170-9334 | Boom Wiring Harness | $89.00 | In stock |
Not sure which of the 3 sections is yours?
Send a photo of the tag on your old harness to WhatsApp +86-13714733803 and we will confirm the part number against this list before you order. Getting the section wrong is the most common reason a replacement does not fit.