The automotive engine and transmission wiring harness can be a very complex and critical piece of equipment. Unfortunately, one single wire out of place can render all of the other wires completely inoperable leading to operation issues or complete lack of function. All LS Harness Connection wiring harnesses are covered for a period of 1 year for the original purchaser against manufacturing defects or damage. If you are in this window and experiencing a problem, it is likely you discovered the issue after installation. Below is a quick reference guide to testing the harness in vehicle should you choose to do on-vehicle testing prior to sending the harness in, or for repair procedures if you are out of the warranty period.

Issues With Your LS Harness Connection Harness?

If you are experiencing issues, you will need a test sheet with the termination points listed that you can go through line by line testing the wire termination points to determine if everything is going to where it needs to.

You will need a multimeter with a continuity/Ohm test function – one that produces an audible beep will be the easiest and fastest method of testing.

Gently insert a test probe into each corresponding terminating position and verify the reading is correct through an audible beeping noise. If no beep is heard, gently adjust your probe to ensure you are making contact with the conductor of the terminal. If your probe cannot reach into the connector, you may wrap a piece of thin wire around the probe tip, or use a clip to create a smaller gauge probe.

Work down the sheet and verify the full connector before making any changes. Please let me know if anything was pinned incorrectly and provide the corresponding connector and position number/letter and I can assist you in proceeding.

You can find detailed testing procedures at the video link below.

Using Multimeter for Continuity Testing - https://youtu.be/x3nqlXM6nOM