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22 to 12 Gauge
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12-1/0 Gauge
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SELECTING AUTOMOTIVE WIRE

     When in doubt, use 125C rated TXL, GXL, SXL, or SGX wire insulation for engine compartment and general wiring.  The only difference between these is the thickness of the insulation and cost, with the thicker being the more expensive. They are all insulated with crosslinked polyethylene, which is almost as heat resistant as teflon, but cheaper and much tougher.
For more detail, see wire tables and amps vs wire size.

TXL Automotive Wire

TXL is the wire used by vehicle manufacturers for most applications, and is the thinnest, lightest, and lowest cost of these insulations. It is tough and long lasting.

To order 18 to 12 Gauge TXL Wire Click Here
GXL Automotive Wire

GXL is an intermediate insulation,with thickness and cost between TXL and SXL.  

To order 18 to 14 Gauge GXL Wire Click Here
SXL Automotive Wire

SXL is the second thickest of the crosslinked polyethylene insulations, and suggested for use in the heavier gauges, or where some additional protection from possible mechanical damage is needed.

To order 12 to 8 Gauge SXL Wire Click Here
SGX Automotive Wire

SGX is the thickest of the crosslinked polyethylene insulations. SGX is particularly recommended for battery cable, because of the rather spectacular consequences of a shorted battery cable.

To order 12 to 8 Gauge SXL Wire Click Here

NOTE: SAE J1128 GPT is a PVC insulated wire rated at 85C used for general chassis wiring, and should not be
      used in the engine compartment of your car according to the SAE J1128 spec. It's not as tough or heat resistant as
      TXL or GXL insulation, but it is considerably cheaper.    This is the wire found in retail stores.
For more info on TXL, GXL, or SXL/SGX Wire,
Click Here

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