{"product_id":"qbp412518","title":"Blue Sea Systems DC Shunt Shifter, For 8255 Digital Meter Shunt, 12-36V DC","description":"\u003ch6\u003eOverview\u003c\/h6\u003e\u003cp\u003eThe Blue Sea Systems 8242 is a shunt shifter that lets a DC digital ammeter read a positive-side shunt circuit when it is paired with the Blue Sea Systems 8255 Digital Meter Shunt. It is used on 12 to 36V DC systems and creates a ground-referenced signal that mirrors the 8255 shunt's 500A\/50mV output.\u003c\/p\u003e\u003cp\u003eThat matters on boats where alternator output or another charging circuit is measured on the positive side, while the digital meter expects the shunt reference on the negative side. The 8242 handles that conversion without moving the main shunt, which helps when the existing cable run is already laid out and hard to change.\u003c\/p\u003e\u003ch6\u003eKey features\u003c\/h6\u003e\u003cul\u003e\n\u003cli\u003eBuilt for positive-side shunt applications such as alternator output measurement\u003c\/li\u003e\n\u003cli\u003eMade to work with the Blue Sea Systems 8255 Digital Meter Shunt\u003c\/li\u003e\n\u003cli\u003eConverts the shunt reference from positive to negative for digital meter use\u003c\/li\u003e\n\u003cli\u003eCreates a ground-referenced signal that matches the shunt's millivolt output\u003c\/li\u003e\n\u003cli\u003eMounts directly to the shunt using the existing sense screws\u003c\/li\u003e\n\u003cli\u003eSuitable for 12 to 36V DC electrical systems\u003c\/li\u003e\n\u003cli\u003eIncludes the hardware needed for installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch6\u003eCompatibility and fit\u003c\/h6\u003e\u003cp\u003eThis adapter is intended for installations built around the Blue Sea Systems 8255 shunt and a digital ammeter that needs a negative-referenced shunt signal. It belongs in the meter and shunt signal path, so it does not replace the shunt or the meter itself.\u003c\/p\u003e\u003cp\u003eIt is a practical fit for charging-system layouts where the shunt is already on the positive side of the circuit. That is common when monitoring alternator output and similar DC current paths on cruising boats, fishing boats, and other vessels with dedicated battery charging instrumentation.\u003c\/p\u003e\u003ch6\u003eInstallation and setup\u003c\/h6\u003e\u003cp\u003eThe adapter fastens directly onto the shunt with the existing sense screws, which keeps the installation compact and avoids extra mounting steps. In refits and service work, that makes it easier to add digital current monitoring without disturbing the heavy cable connections around the charging circuit.\u003c\/p\u003e\u003cp\u003eFor the cleanest result, install it close to the shunt in a protected electrical area where the meter wiring can be kept tidy and easy to trace later. That approach also makes future troubleshooting simpler if you are checking alternator output or charging performance.\u003c\/p\u003e\u003ch6\u003eUse on board\u003c\/h6\u003e\u003cp\u003eThis part suits boats that need a digital ammeter reading from a positive-side shunt circuit without relocating the shunt. It makes the most sense in panel upgrades and charging-system updates where the electrical layout is already fixed and the goal is to add clear current monitoring with minimal disruption.\u003c\/p\u003e","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":52023027859637,"sku":"QBP412518","price":138.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/8171\/1029\/files\/1329819_qbp412518.jpg?v=1780191634","url":"https:\/\/www.qualityboatparts.com\/products\/qbp412518","provider":"Quality Boat Parts","version":"1.0","type":"link"}