Caterpillar 345B Fuse Box Wiring Harness Assembly

Part number reference for the 155-2490

This harness is one part sold under one number. Suppliers and parts books write it differently — you may see it as 155-2490, 1552490 · CA1552490. They are all the same part; the number on the tag of your old harness is what settles the order.

If the tag shows a different number entirely, do not order by eye — send us a photo of it on WhatsApp and we will match it against the catalogue before anything ships.

Where this harness sits on the Caterpillar 345B

It sits in or immediately behind the fuse and relay box, where battery power is split into the individual circuits.

What it connects

• Battery feed to the fuse block — the main power distribution point for the circuits it serves.
• Relay coil and contact circuits — the low-current control side and the high-current load side.
• Ground return for the box — shared return for everything fed from that block.

What a failing Caterpillar 345B harness looks like

These are circuit-level symptoms, not a diagnosis. The same behaviour can come from a sensor, an ECM input or a mechanical fault — the checks below are how you tell them apart.

How to confirm it is the harness before you buy

1. Compare the part number on the old harness. The number is printed on a tag or moulded into the main connector body. If it does not match, stop — stop here and send us a photo, because two sections of the same machine are not interchangeable.
2. Resistance test the suspect run. Disconnect both ends and measure end to end. A reading that is far above the others in the same loom means broken strands; a reading to ground means chafing.
3. Wiggle test under load. Back-probe the circuit with the machine running and flex the loom by hand along its length, especially at clips and at the cab or boom entry. If the meter or the fault jumps, you have found the run.

Where this part sits in the Caterpillar 345B range

ECS lists 2 harnesses in this section group for this machine. At $396.00 the 155-2490 is the most expensive, against a range of $350.00 to $396.00. Stock on hand: 3.

The closest part in price is 218-4697 at $350.00 — $46.00 apart. The two are separate looms; the tag on your old harness settles which one you need.

We photographed this exact unit: 6 images on this page are of the 155-2490 we have in stock, not a catalogue picture. Price tracks section size and how much of the loom is enclosed, not condition — every part we list is new build.

Other harness sections for the Caterpillar 345B

All 12 harness sections for the Caterpillar 345B →

Same type of harness on other machines

• 240-5812 — Caterpillar 320CS Fuse Box Harness Assembly
• 259-5223 — Caterpillar 320D Fuse Box Wiring Harness
• 283-2833 — Caterpillar 328D Fuse Box Wiring Harness
• 132-1979 — Caterpillar 330B Fuse Box Wiring Harness Assembly
• 153-0286 — Caterpillar 330B Fuse Box Wiring Harness Assembly