Wire Harness RFQ Guide
A practical guide to preparing drawings, BOM files, connector details, pinout, wire specifications, samples and testing requirements for a custom wire harness quotation.
A clear wire harness RFQ helps reduce back-and-forth communication and allows the manufacturer to review your project more efficiently. This guide explains what information is helpful before quotation, prototype discussion or repeat production planning.
What Is a Wire Harness RFQ?
A wire harness RFQ is more than a request for a unit price. It provides the technical and project information needed to understand the wiring structure, components, manufacturing requirements and inspection expectations.
A wire harness RFQ is a request for quotation that includes the technical and project information needed to review a custom wiring assembly. Unlike a simple product inquiry, a wire harness RFQ usually depends on drawings, wiring diagrams, connector information, wire specifications, branch lengths, labels, sleeves, samples, quantity and testing requirements.
The goal is not only to ask for a price. A good RFQ helps confirm whether the harness structure, materials, connectors, production process and inspection requirements can be reviewed clearly before quotation or sample discussion.
If your project is mainly a connectorized cable assembly rather than a multi-branch wire harness, you may also review the Cable Assembly RFQ Guide.
Wire Harness RFQ Checklist
You do not need to have every file ready before contacting WireLoomTech. However, the more complete your information is, the easier it is to review the project accurately and reduce unnecessary communication.
- Drawings or wiring diagrams
- BOM files or component lists
- Connector brand and part numbers
- Terminal and housing requirements
- Wire gauge and cable specifications
- Cable length and branch length
- Pinout or wire sequence
- Wire color and circuit function
- Labels, sleeves or protection requirements
- Estimated quantity and project stage
- Sample photos or physical samples
- Testing and packaging requirements
- Target application or equipment type
Drawings, BOM Files and Samples
Wire harness projects may begin with different types of information. Some customers have complete drawings and BOM files, while others only have samples, photos or an existing assembly that needs to be reproduced or modified.
Drawings and Wiring Diagrams
Drawings and wiring diagrams help show the harness layout, cable length, branch length, connector position, wire sequence, labels, sleeves and assembly structure. They are especially helpful when a project includes multiple branches or circuits.
Drawing & Wiring Diagram GuideBOM Files
A BOM file helps identify the wires, connectors, terminals, housings, sleeves, labels and other components used in the wire harness. It also helps reduce uncertainty when specific brands or part numbers are required.
BOM Preparation GuideSamples or Photos
Physical samples or clear photos can help review structure, routing, connector type, branch length and application context when drawings or BOM files are incomplete. Additional confirmation may still be needed before production.
Sample-Based Manufacturing GuideConnector, Pinout and Wire Specification Details
For many custom wire harness projects, connector and pinout information is critical. Clear connector details and wire sequence information help reduce misunderstandings during quotation review, sample preparation, production and testing.
Connector Details
Useful connector information may include connector brand, part number, housing type, terminal type, mating direction and whether equivalent components are acceptable.
Pinout and Wire Sequence
Pinout information may include pin number, wire color, circuit function, polarity, wire sequence and connector-to-connector wiring relationship.
Wire and Cable Specification
Wire information may include wire gauge, insulation type, color, cable structure, shielding requirements, jacket material and application environment.
Common Missing Information in Wire Harness RFQs
Many RFQs are delayed because key information is missing or unclear. The following items are often needed before a quotation or sample discussion can move forward efficiently.
- Connector part numbers are not confirmed
- Pinout or wire sequence is missing
- Wire gauge or cable specification is unclear
- Cable length or branch length is not defined
- Terminal or housing requirements are incomplete
- Testing requirements are not described
- Quantity or project stage is not provided
- Photos do not show connector direction clearly
- Samples differ from the intended production version
Incomplete information does not need to stop the discussion.
If some information is not available yet, you can still send the current files or photos. WireLoomTech can review the available information and help identify what additional details may be needed.
How WireLoomTech Reviews Wire Harness RFQ Information
After receiving your RFQ information, WireLoomTech reviews the project based on the available drawings, BOM files, samples, connector details, pinout, wire specifications, quantity and testing requirements.
Project Information Review
We review drawings, wiring diagrams, BOM files, samples and application requirements to understand the harness structure and project scope.
Component and Specification Check
Connector details, terminal requirements, wire specifications, branch length, labels and protection requirements are checked against the project information.
Manufacturing and Testing Discussion
If key details are clear, the project can move toward quotation, sample discussion, production process review and testing requirement confirmation.
Related Guides and Resources
These pages may help you prepare more complete RFQ information before sending a custom wire harness project for review.
Wire Harness RFQ Questions
These answers cover common questions about preparing custom wire harness quotation information.
What should I include in a wire harness RFQ?
Can I request a quote if my drawings or BOM files are incomplete?
Are physical samples useful for wire harness quotation?
Do testing requirements need to be included in the RFQ?
Ready to Prepare Your Wire Harness RFQ?
Send your available drawings, BOM files, connector details, pinout, wire specifications, samples, photos, quantity and testing requirements. WireLoomTech will review the information and follow up for quotation discussion.