Harness Repair & Diagnostic Service

Not sure whether your wiring harness can be repaired? Purchase this service to reserve a professional inspection from LMMF Simplified Wiring.

The $25 diagnostic fee includes: initial inspection, diagnosis, a repair estimate before work begins, and return shipping after inspection or repair. The cost of any approved repair is separate.

How It Works

Purchase this service to reserve your repair evaluation.
Ship your harness to LMMF Simplified Wiring. You are responsible for shipping it to us.
We inspect the harness for wiring damage, connector damage, previous repairs or modifications, overall condition, and repairability.
We contact you with our findings and a repair estimate before any repair work starts.
Approve the estimate if you would like us to proceed. We invoice only the approved repair cost.
After payment, we complete the repair and return-ship your harness.

What’s Included

Repair-order reservation
Complete harness inspection and diagnostic evaluation
Repair estimate before work begins
Return shipping of your harness

Important Information

The $25 diagnostic fee is non-refundable once your harness has been received and evaluated.
The diagnostic fee does not include parts, materials, or repair labor beyond the initial evaluation.
Customer-paid shipping is required to send the harness to LMMF Simplified Wiring.
Return shipping is included with this service.
If a harness is beyond economical repair, we will contact you with available options before proceeding.
We never perform repairs without your approval.

Please Include With Your Harness

Your name and phone number
Your return shipping address
Vehicle year, make, and model, if applicable
Engine and ECM/PCM information, if known
A detailed description of the issue or symptoms
Any prior repairs or modifications made to the harness

Turnaround Time

Inspection typically begins within 1–3 business days after your harness arrives. Repair turnaround varies based on damage, required materials, and current workload.

Ship Your Harness To

LMMF Simplified Wiring
18770 State Route O
Rolla, MO 65401

Frequently Asked Questions

Does the $25 fee include the repair?
No. The $25 covers the initial inspection, diagnosis, estimate, and return shipping. Repairs are quoted and billed separately only after you approve them.

Will you repair my harness without asking first?
No. We contact you with the estimate and wait for your approval before performing any repair work.

Who pays to ship the harness to LMMF?
You are responsible for shipping the harness to us. Return shipping is included in the diagnostic service.

Country/region

Collection: Harness Repair & Diagnostics

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Harness Repair & Diagnostic Service

Harness Repair & Diagnostic Service