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Repairing Wiring Harnesses

A guide to probing and poking.

Wiring Harness Tips & Tricks

Find out what engine builders need to make better harnesses for their customers.

VIDEO: Wiring Harnesses On New Fuel Pumps

Andrew Markel explains why you should install the wiring harness that comes with a new fuel pump, even if there is not a problem with the old one.

Wiring Harness Diagnostics On Dodge Sebring

This month’s Diagnostic Dilemma begins with a 2004 Dodge Sebring, 2.7-liter VIN R, which ended up in a towing company parking lot after stalling on a rough country road.

Audi Wire Harness X-Ray

The 2018 Audi A8 is a mild-hybrid technology vehicle, with a belt alternator starter (BAS) and a lithium-ion battery.

VIDEO: Don’t Try To Repair A Wheel Speed Sensor Harness

Andrew Markel discusses wheel speed sensors, and how a repair should generally not be attempted on its wiring.

Serial Data Bus Diagnostics

If serial data buses did not exist, a wiring harness would have to be five times its normal size and use twice as many sensors to deliver the same level of functionality and safety we see in the modern vehicle.

Fuel Tanks and Pumps

The behavior of the fuel wells, pumps & sending units are often misdiagnosed, leading to fuel pumps being replaced.

Taking Advantage of Vital Software Tools: Special Tests

The Special Test menu has functions that can help you diagnose a problem, finish a repair, and confirm the fix. This video is sponsored by Bosch.

PCV System DTC

PCV systems control crankcase pressure.