Automotive low-voltage harness: the equipment list
Body harnesses may include sealed and unsealed connections. Splice durability, vibration requirements and crimp inspection follow the customer drawing and acceptance plan; cross-section and pull-test results provide different evidence. Wire runs 0.35–6 mm² with thin-wall insulation that nicks easily. Here is what the line needs, in process order, and where automotive differs from appliance work.
| Step | Equipment | Why it's needed |
|---|---|---|
| 1. Cut & strip thin-wall wire | Automatic cut and strip or double-end line | Thin-wall FLRY-class insulation: belt feed and set cutter depth so the strands stay whole |
| 2. Seal insertion + crimp | Double-end seal insertion and crimping machine | Rubber seal onto the wire, then the terminal over it, both ends, at 3,000 pcs/h on AWG 28–16 |
| 3. Seal + crimp + housing | Double-end crimp, seal and housing insertion machine | AWG 24–12 leads finished into the sealed housing in one line, up to 2,000 pcs/h |
| 4. Splicing | Ultrasonic wire welder | Solder-free copper splices, 0.75–20 mm² gathered section, for branch joints under tape |
| 5. Taping | Harness taping machine | Spiral, spot and multi-segment wrapping on Φ3–30 mm bundles; 1,050 mm traction for long trunks |
| 6. Prove the crimp | Cross-section analyzer and pull tester | Compression ratio and voids at 30–312X; pull to 500 N on the first piece after each die change |
| 7. Sequence check | Wire sequence and color detector | Every cavity verified by vision in 0.25 s before the connector leaves the station |
Watch the machines on this line running real wire
Close-ups of the heads listed above, 10–30 seconds each, on wire like yours. If one answers your question, send 2–3 metres of your own and we run it on that head, on video, before you order.
More clips on these questions:Will the die match my terminal? · Waterproof seals and connector housings: can the machine do the whole end? · Taping: can a machine wrap a single wire, or only a bundle? · Prove the crimp: cross-section and pull
Seal insertion for connectors that require it
For automotive connectors designed with individual wire seals, a rubber seal goes onto each wire before terminal crimping — and the seal must sit at the right depth or the crimp captures it. Doing this by hand is slow and the depth varies. The WM-377 inserts seals and crimps both ends of AWG 28–16 wire at 3,000 pcs/h; the WM-3140FS runs two 0.2–2.5 mm² wires in parallel at 1,200 pcs/h; the WM-396 takes AWG 24–12 all the way into the housing. Which one fits depends on your seal and terminal part numbers — send them with the inquiry, because seal feeding is tooled to the seal.
Why the cross-section photo, not the pull number
Automotive customers audit crimps the way the terminal maker specifies them: crimp height, compression ratio, no voids between strands, burr within limit. A pull test only says the joint held today. The WM-813 cuts, grinds, etches and measures the crimp at 30–312X on 0.01–30 mm² wire; the WM-818 puts cutting and grinding on one bench up to 120 mm². Pair it with the WM-820 for the routine pull to 500 N with recorded values. For the thin-wall insulation itself, the question to ask any stripper is whether it nicks strands — the clips below show the strand bundle at the moment the slug comes off, which helps guide inspection but does not replace magnified strand inspection or the agreed acceptance test.
Automotive harness equipment — common questions
What equipment does an automotive body harness line need?
Cut and strip for thin-wall wire, a seal insertion and crimping machine (double-end for volume), a crimp-seal-housing line for leads that finish into sealed connectors, an ultrasonic welder for branch splices, a harness taping machine, a cross-section analyzer and pull tester for crimp validation, and a vision wire-sequence detector at the connector station.
Which machine puts the rubber seal on and crimps?
The WM-377 for double-end work on AWG 28–16 at 3,000 pcs/h, the WM-3140FS for two 0.2–2.5 mm² wires at once, and the WM-396 when the lead should also be inserted into the housing (AWG 24–12, up to 2,000 pcs/h). Seal feeding is tooled to your seal part number, so send seals with the wire and terminal samples.
Ultrasonic splice or crimp splice?
For branch splices under tape, ultrasonic welding fuses the copper with no solder and no splice band — the WM-711 covers 0.75–20 mm² gathered cross-section, the WM-717S 0.7–30 mm², the WM-718 up to 50 mm². Copper-band splicing presses are the alternative where the specification calls for a band.
How do automotive customers want the crimp proven?
By cross-section: crimp height, compression ratio, voids and burr, measured on a sectioned and etched sample at 30–312X. The WM-813 and WM-818 do this on the bench. The pull test is still run — the WM-820 records values to 500 N — but on its own it does not satisfy an automotive audit.
What should an inquiry include?
Wire sizes and insulation type, terminal part numbers with their applicators, seal part numbers, housing types, splice sizes, typical harness length and harnesses per shift. Then courier wire, terminals and seals — we run them on the machines, on camera, and send the section photos with the quotation.
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