Engine Wiring Harness for Jaguar Series 3 XJ6 with 4.2 Engine Wiring Harness for Jaguar Series 3 XJ6 with 4.2 Litre Engines. ( DAC2389 ) Related Items: Fit my Jaguar XJ6 SIII well. Can't ask much more than that. Shipped fast. No problems. Would have appreciated a diagram showing what each connector went to, but that's above and beyond.5/5(1) Terrys Jaguar Parts: Wiring Harnesses Wiring Harnesses - Since 1976, Terry's Jaguar has been in the business of supplying a wide range of parts for Jaguars - everything from XK120, XK140, XK150 and all XKE / E-Type Parts models right through to the latest Jaguars on the road. When you need a part for your Jaguar E Type - we are the people you will want helping you.