How to Splice Automotive Wires
Updated: Jan. 29, 2024
Use a professional tool and moisture sealant for first-class results.
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Introduction
Use a professional crimper and electrical moisture sealant to make quick, solid connections in auto wiring.Tools Required
- Crimper
Materials Required
- Butt connectors
- Electrical moisture sealant
Project step-by-step (3)
Crimp the Connector
Crimp-on wire connectors work well if they’re crimped properly (a 5/16-in.-wide crimp) and sealed (usually with heat-shrinkable tubing). But most cheap crimping tools only make a 1/8-in. crimp, so you’d have to make four of them for a simple butt connection. Buy a professional crimping tool and a roll of electrical moisture sealant.
Strip the insulation so only the bare wire is inside the connector. Then make a single 5/16-in. crimp on each side of the butt connector.
Cut the Moisture Sealant
Cut a section of moisture sealant to cover the entire connector and a 1/2-in. overlap on each end.
Seal the Splice
Double it over and squeeze it together with your fingertips.