What are the customization options for a truck wiring harness?

 

 

A stock harness fits one truck. Once a body builder adds a refrigeration unit, a crane or a telematics box, the original part is the wrong shape. These are the eight points we change.

 

 

 

 

1. Connector Types

 

 

 

 

Connectors come first, because they set the crimp tooling and the seal. Deutsch DT covers chassis, lighting and engine bay circuits, DTM is the smaller shell for sensor signals, and DTP takes the feeds to starter and alternator. For a MAN truck, our Engine Wiring Harness for Man comes with connectors selected for that engine.

 

 

 

 

2. Wire Gauge

 

 

 

 

Gauge follows the load and the length of the run. A starter feed needs a heavy conductor, a sensor pair a light one, because a thick wire will not crimp or seal inside a small shell. Send the load in amps and the run in metres, and the gauge falls out of the calculation rather than a guess.

 

 

 

 

3. Harness Length

 

 

 

 

Length is measured along the route, around brackets and through the frame, never in a straight line across the truck. Extended cabs and body conversions move the end points. We leave a service loop at every hinge, so the loom flexes instead of pulling on a terminal.

 

 

 

 

4. Colour Coding

 

 

 

 

Colour is a maintenance decision. We follow a standard scheme, or print your own circuit legend if your workshop already works to one. A base colour with a tracer is enough to trace a wire behind a dash without a meter.

 

 

 

 

5. Protective Jackets

 

 

 

 

Jackets are chosen by what the harness meets: PVC for chassis runs and light abrasion, XLPE for engine bay heat, silicone where heat and flexibility both matter, PTFE for the hottest and most chemical-exposed lines. Conduit and adhesive-lined heat-shrink go on top wherever a clip would rub.

 

 

 

 

6. Specialized Circuits

 

 

 

 

A refrigerated body, a crane, a tipper or a light bar needs circuits the original loom never had. We build the relay, fuse and switch into the harness, with their own ground return, rather than splicing into a circuit sized for something else.

 

 

 

 

7. Compatibility with Aftermarket Parts

 

 

 

 

Audio, navigation, telematics and camera kits all draw power and put signal on the loom. We build the accessory connector into the harness and keep its ground separate, so a fault in the accessory does not take the engine circuit down with it.

 

 

 

 

8. Custom Labels and Markings

 

 

 

 

Labels are printed on heat-shrink sleeve that goes on before the terminal is crimped, so they cannot fall off in service. Each branch end carries the circuit ID, the connector designation and the part number. Send your legend, or we mark to your circuit list.

 

 

 

 

 

 

Left: bulkhead connector on an FH12 engine harness. Right: a MAN engine harness branched into six sleeved legs, each labelled at the end.

 

 

9. How to Send a Custom Request

 

 

 

 

Three things make a quote accurate: the circuit list with loads, the connector families you want or a photo of the original, and the length measured along the route. Send a sample if the harness is off the truck. We reverse-engineer from it, or build to your drawings if you have them.