Blue Sea 4017 Straight Terminal CableCap - Large

The Blue Sea 4017 Straight Terminal CableCap is an essential protective accessory for any marine electrical system. Designed to insulate and protect battery terminals with standard automotive posts, this large-format cable cap prevents accidental shorts, corrosion, and electrical hazards that can disable your boat or damage sensitive electronics. Whether you're maintaining a freshwater fishing rig or a coastal cruiser, terminal protection is a critical—and often overlooked—component of reliable onboard power management.

Manufactured by Blue Sea Systems, a trusted name in marine electrical engineering, the 4017 cable cap features a precision-molded design that fits standard automotive-style battery posts with a secure, non-slip fit. The insulating material resists saltwater corrosion, UV degradation, and engine compartment heat, ensuring long-term durability in harsh marine environments. The straight terminal configuration allows for clean, direct cable routing without awkward bends that can weaken connections over time, while the large size accommodates standard marine battery post gauges used on most recreational and commercial vessels.

This cable cap is ideal for boat owners who demand reliability during extended runs on open water and anglers who depend on consistent electrical performance for trolling motors, fish finders, and onboard navigation systems. Installation is straightforward—simply slip the cap over the battery terminal post and tighten the internal set screw for a permanent, vibration-resistant seal. Compatible with standard automotive battery posts found on most marine dual-battery setups, starting systems, and auxiliary electrical banks, the Blue Sea 4017 is a low-cost insurance policy against electrical failures when you're miles from shore.