What are the Differences between the Types of Primary Automotive Wires?

Primary Automotive Wire

With all the different types of primary automotive wire, it can be hard to determine which one is the right choice for your application. You'll need to understand the environment that the wire will be used in to help you select the right type.

To understand the differences between the types, you'll need to know the difference between PVC and Cross-link automotive wire. The main difference between the two is the temperature range. Cross-link automotive wire can withstand higher temperatures and stress than PVC.

As always, if you have any additional automotive wire questions that we don't cover in this article, please contact us!

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Cross-Link Automotive Wire

Cross-link automotive wire can withstand higher heat, abrasion, extra durability and aging. It’s often used in high-stress applications like race or industrial use vehicles. Cross-linked insulation is created by extruding the material through a tube, under heat and pressure, in order to "cross-link," or change the molecules of insulation to another state. Cross-link automotive wire is compatible with most automotive connectors.

Cross-link automotive primary wire is comprised of three different types of wire:

Type GXL Wire

GXL wire features a thin wall or thickness and is used mainly for trucks and trailers. GXL has a temperature range of -40°C to 125ºC. GXL has excellent heat resistance and has a smaller diameter and lighter weight than standard duty S.A.E J1128, Type SXL.

Type SXL Wire

SXL wire features a standard wall or thickness, has excellent heat and abrasion resistance, and is used for general circuit wiring. SXL has a temperature range of -40°C to 125ºC

Type TXL Wire

TXL wire features an extra thin wall or thickness, has excellent heat resistance and flexibility, is used for general circuit wiring and has a temperature range of -40°C to  125ºC. TXL thin wall feature makes it easier to pull through tight spaces.

PVC Automotive Wire

Polyvinyl Chloride (PVC) is a synthetic, thermoplastic material made by polymerizing vinyl and chloride. PVC automotive wire is typically found in under-hood or cabin applications. It has insulation that is highly durable and resistant to oil, grease, and acids, making it ideal for automotive, truck, trailer, marine, construction, and many other automotive electrical connections.

Type GPT Wire

GPT wire features a standard wall that is typically used for trailer wire and general circuit wiring and has excellent resistance to oil, flame, and abrasion. GPT has a temperature range of -40°C to 85ºC.

Type TWP Wire

TWP wire features a thin wall, lead-free, and is rated at 105ºC.

Type HDT Wire

HDT wire is a heavy-wall automotive wire and rated at 85ºC. HDT is used where greater physical protection is required and designed for surface vehicle electrical systems.

Primary Automotive Wire Overview

Name Type Temperature Use Specifications
GXL Cross-Link -40°C to 125ºC Thin wall. Most common.
Engine compartments - higher heat.

Chrysler Specification MS-8900

Ford Specification ESB-M1L85-B (bare copper) ESB-M1L85-A (tinned copper), S.A.E J1128

SXL Cross-Link -40°C to 125ºC Standard Wall.
Engine compartments where higher resistance is needed.

Chrysler Specification MS-5919 (bare copper)

Ford Specification ESB-M1L85-A (bare copper)

Ford Specification ESB-M1L8-A (tinned copper)

TXL Cross-Link -40°C to 125ºC Extra Thin Wall.
Smallest and Lightweight.

MS-8288 (bare copper)

Ford Specification ESB-M1L123-A (bare copper)

Ford Specification ESB-M1L123-A2 (tinned copper)

GPT PVC -40°C to 85ºC General Circuit Wiring S.A.E J 1128
TWP PVC -40°C to 105ºC Thin Wall.
Lightweight and Small.
S.A.E J 1128
HDT PVC -40°C to 85ºC General Circuit Wire
Thickest Wall.
SAE J-1128, Ford M1L-50A, Chrysler MS-3494

Understanding your application, how the wire is being used, and the environment and temperature it will be used in can help you determine the appropriate automotive primary wire you'll need. If you have additional questions, feel free to contact Lapp Tannehill either by phone, email, or chat. Our knowledgeable customer service team are ready to help.

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