Use a professional crimper and electrical moisture sealant to make quick, solid connections in auto wiring.
By the DIY experts of The Family Handyman Magazine
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Splice automotive wires in seconds
Photo 1: Crimp the connector
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.
Photo 2: Cut the moisture sealant
Cut a section of moisture sealant to cover the entire connector and a 1/2-in. overlap on each end.
Photo 3: Seal the splice
Then double it over and squeeze it together with your fingertips.
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.