Caterpillar C15 Wiring Harness Parts | TPI truckpartsinventory›Wiring Harnesses›CaterpillarCheck out 25 Caterpillar C15 Wiring Harness Parts for sale. We help you find the heavy duty truck parts that you need. 2007 Caterpillar C15 (Stock #PT-0415-242) Engines & Engine Parts / Wiring Harnesses. New C15 Wire Harness Call the following number for the part. 1-855-425-7109. Caterpillar C15 (Stock #514-11573) Caterpillar Wiring Harness: Heavy Equipment Parts & Accs I have 2 Caterpillar wiring harness adapters that were hooked to attachments, but never saw service. This is the 8 pin to 12 pin adapter. This is an auction/sale for 1 adapter.