Lisle 37990 Electrical Connector Pliers - Easy Connector Removal

In this review of the Lisle 37990 Electrical Connector Pliers the bottom line is simple: this tool is for technicians and DIYers who frequently disconnect electrical connectors and need a durable, comfortable tool that saves fingertips and time. The pliers remove many single and double connectors found on cars, trucks and heavy-duty vehicles with a narrow knurled tip that grips in tight spaces, and a spring handle that enables one-handed operation. Overall, it is a straightforward, workshop-ready disconnect tool that delivers reliable utility without unnecessary bells and whistles.

Key Features

• Connector compatibility: The tool removes many single and double connectors found on a wide range of cars, trucks and heavy-duty vehicles, reducing connector damage during service.
• Narrow knurled tips: Narrow, textured tips provide extra grip when working in confined areas, helping to free stubborn terminals without slipping.
• Forged carbon steel: The 8in forged carbon steel construction offers toughness and durability so the pliers hold up to repeated shop use.
• Spring-loaded handle: A spring in the handle enables one-handed use and reduces hand strain when repeating disconnects across a wiring harness.
• Comfort grips: Dual material grips improve comfort and control during longer jobs, helping protect fingers when leverage is required.

Who It's For

The Lisle 37990 is best for automotive technicians, home mechanics and fleet maintenance crews who regularly service electrical connectors and need a compact, reliable tool that reaches tight spots. Its narrow tips and knurled faces make it particularly useful when working around packed engine bays or behind trim where space and visibility are limited.

Someone who rarely works on vehicles or only performs basic battery and bulb changes might not need a dedicated connector plier and could look for a multipurpose pliers set instead. This is a specialist disconnect tool intended for repeated use rather than occasional household tasks.

Pros & Cons

Pros

• Durable forged carbon steel construction gives long service life under shop conditions.
• Narrow knurled tips provide precise grip for removing hard-to-reach connectors without slipping.
• Spring-loaded handles and dual material grips make one-handed operation comfortable and efficient.
• Works well on a wide range of single and double electrical connectors commonly found on vehicles.

Cons

• Specialized design means it is less versatile than general-purpose pliers for non-electrical tasks.
• May not fit every exotic or unusually shaped connector used on some late-model or specialty vehicles.

Specifications

Brand	Lisle
Model	37990
Tool length	8in
Material	Forged carbon steel
Tip style	Narrow knurled tips
Handle	Spring-loaded with dual material grips

Our Verdict

The Lisle 37990 is a practical, well-built electrical connector plier for professionals and serious DIY mechanics who need a reliable tool for repeated connector removal. Its narrow knurled tips, durable forged carbon steel body and one-handed spring action make it excellent value for workshop use, though casual users with infrequent needs may prefer a more general tool.

Frequently Asked Questions

Will these pliers work on both single and double connectors?
Yes, the design removes many single and double connectors commonly found on cars, trucks and heavy vehicles.

Are the tips suitable for tight spaces?
Yes, the narrow knurled tips are intended to provide extra grip and reach into confined areas.

Is the tool comfortable for repeated use?
Yes, the spring in the handle and dual material grips reduce hand fatigue and allow one-handed operation.