Since you’re looking at this auction you're probably considering buying a complete wiring harness verses extending a short pigtail. Or Maybe the mirror your buying has no harness or pigtail. The advantage of buying a complete harness is first you're not scrambling to find the correct wire to use. Even if you get the correct wire the extended wire connections should get soldered and shrink sleeves placed over them. Now if your mirror has a temperature feature it's mandatory that all external connections be soldered. Because poor external connections corrode quickly and that will affect the accuracy of the temperature readings. With the kit are wire ties, solderless connectors for the connections to the vehicle harness, instructions, and even the obligatory wire cover.

Harness material quality is important too. Most parts supply wire and aftermarket kit wire is rated for 80 degrees C (175 degrees F). Most temp sensor wire loom is rated for 200 degrees or less. The current kits we are selling have Oem automotive spec (crosslink) wire and Oem spec loam. That's 125 degree C (255 degree F) wire and 300 degree wire loam. This is important because a car’s internal temperatures can exceed 175 degrees. Under hood temperatures often exceed 200 degrees so our wire loom is rated for 300 degrees and not the substandard 200 degree loom available. All our harness wire is Automotive crosslink wire, and not speaker wire or some other sub-standard wire. Crosslink wire is resistant to moisture, grease, oil, gasoline, and most acids and solvents. The other benefit of the crosslink wire is it's abrasion resistance. Why take a chance on inferior materials? Full instructions with professional support provided via email.