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As a former Professional Marine Technician of more than 20 years, I noticed an electrical issue occurring when my GPS was shutting off because of poor connections due to corrosion of the Negative Bus Bar. As I consider future possible electrical upgrades, I decided to install a Blue-Sea-ST-5025-6 Circuit Fuse Block with Negative Bus Bar. This is available for purchase over the counter for an average cost of $35.00. If you still have any questions after watching this video, feel free to post your questions/comments below.