Sierra Piercing Probe Set 18-99555 for Marine Electrical Wire Testing

The Sierra Piercing Probe Set (18-99555) gives marine technicians and DIY boat owners a fast way to test voltage, continuity, and circuit integrity directly through insulated wiring without cutting, stripping, or otherwise damaging the wire jacket. Each probe is designed to pierce the outer insulation of a wire, make contact with the conductor underneath, and connect to a multimeter or test light for an accurate reading, then seal back up so the wire stays protected from moisture and corrosion once testing is complete. This makes the set especially useful in the marine environment, where re-stripped or nicked wire ends are a common source of future corrosion and intermittent electrical faults.

Piercing probes like this set are commonly used for diagnosing boat wiring harnesses, trolling motor circuits, bilge pump wiring, navigation lights, and other 12-volt and low-voltage marine electrical systems where quick in-line testing is needed without disturbing a finished wire run. The set is compact and lightweight, making it easy to keep in a tool bag or tackle box alongside a multimeter for routine troubleshooting.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-99555
• Product Name: Piercing Probe Set
• Category: Specialty Tools
• Weight: 0.3 pounds
• UPC: 736983855107

Frequently Asked Questions

What is the Sierra 18-99555 Piercing Probe Set used for? It is a set of piercing test probes used to check voltage and continuity on insulated wiring without cutting or stripping the wire, which is useful for marine electrical troubleshooting on boats.

Does the piercing probe damage the wire insulation permanently? The probe tip pierces the insulation just enough to contact the conductor for testing; once removed, the small puncture point is much less invasive than cutting or stripping the wire, though it is still a piercing action rather than a non-invasive clamp test.

Can this probe set be used with a standard multimeter? Yes, the Sierra 18-99555 Piercing Probe Set is designed to connect to a multimeter or test light so you can take voltage or continuity readings directly on the wire being tested.

How much does the Sierra Piercing Probe Set weigh? The Sierra 18-99555 Piercing Probe Set weighs 0.3 pounds.

Is this set suitable for marine 12-volt wiring systems? Yes, this set falls under specialty electrical test tools and is commonly used for diagnosing 12-volt and low-voltage marine wiring such as bilge pumps, navigation lights, and trolling motor circuits.

What brand is part number 18-99555? Part number 18-99555 is manufactured by Sierra.

Is the Sierra Piercing Probe Set a single probe or a set? It is sold as a set of piercing probes, not a single probe, as indicated by its product name.

What category of tool is the Sierra 18-99555? The Sierra 18-99555 is classified as a specialty tool, specifically an electrical piercing probe set.

Can the Sierra Piercing Probe Set help find intermittent electrical faults? Yes, piercing probes allow you to test a wire at multiple points along a harness, which helps isolate intermittent connections or breaks in marine wiring without disturbing the finished wire ends.

What is the UPC for the Sierra 18-99555 Piercing Probe Set? The UPC for the Sierra Piercing Probe Set, part number 18-99555, is 736983855107.