{"product_id":"stinger-sgp35-500-amp-relay-and-isolator-heavy-duty-battery-control","title":"Stinger SGP35 500-AMP Relay and Isolator - Heavy Duty Battery Control","description":"\u003cp\u003eIn this review of the Stinger SGP35 500-AMP Relay and Isolator, the bottom line is simple: this is a heavy-duty, no-frills relay for anyone adding a secondary battery to a 12 volt system who needs reliable high-current switching. The reviewer found it especially useful for commercial truck installs and car audio systems because it prevents the primary battery from discharging when the engine is off while still allowing full charge back to auxiliary batteries when the ignition is on. It is built to last and performs its core task without unnecessary complications.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e500 AMP contact rating:\u003c\/strong\u003e Handles high current draws common in large audio systems and commercial vehicle setups without noticeable voltage drop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents primary battery discharge:\u003c\/strong\u003e Keeps the starter battery isolated when the ignition is off so electronics or accessories do not drain the main battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower on demand:\u003c\/strong\u003e Automatically connects batteries when the ignition is turned on, providing charging to auxiliary batteries only when appropriate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater resistant phenolic housing:\u003c\/strong\u003e Durable black phenolic plastic helps protect the relay in damp engine bays or exposed installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal 12 volt compatibility:\u003c\/strong\u003e Works with a wide range of alternators and charging systems, simplifying integration into most vehicles.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis relay is aimed at vehicle owners and installers who need a high-current, dependable solution to add and manage secondary batteries in cars, trucks, RVs and commercial vehicles. It is a good fit for car audio enthusiasts who run large amplifiers, fleet technicians who outfit trucks with auxiliary systems, and anyone who wants straightforward battery isolation without smart electronics.\u003c\/p\u003e\u003cp\u003eThose who want integrated battery sensing, timed disconnects or multi-stage charging intelligence should look elsewhere; the SGP35 is a robust mechanical relay\/isolator focused on high current handling and reliability rather than advanced battery management features.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHigh 500 AMP rating supports heavy amplifier loads and large auxiliary battery charging.\u003c\/li\u003e\n\u003cli\u003eWater resistant phenolic case improves durability in exposed locations.\u003c\/li\u003e\n\u003cli\u003eSimple wiring and reliable operation make installation quick for installers and DIY users.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eIt is a purely mechanical relay without advanced charging control or smart sensing features.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSGP35\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact rating\u003c\/td\u003e\n\u003ctd\u003e500 AMP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e12 volt applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing\u003c\/td\u003e\n\u003ctd\u003eWater resistant black phenolic plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical life\u003c\/td\u003e\n\u003ctd\u003e100,000 cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eCompatible with all alternators and charging systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Stinger SGP35 is a reliable, high-current relay ideal for anyone who needs straightforward battery isolation and robust amperage handling. Its durable construction and simple operation deliver strong value for car audio installs and commercial vehicle battery systems, while buyers seeking intelligent charging features should consider a different product.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this relay work with my vehicle alternator?\u003c\/strong\u003e\u003cbr\u003eYes, the SGP35 is compatible with all types of alternators and charging systems in 12 volt vehicles.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it prevent the starter battery from draining?\u003c\/strong\u003e\u003cbr\u003eYes, the relay keeps the primary battery isolated when the ignition is off to prevent discharge from accessories.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it weather resistant for engine bay mounting?\u003c\/strong\u003e\u003cbr\u003eIts water resistant black phenolic plastic housing helps protect the relay in damp or exposed installations.\u003c\/p\u003e","brand":"STINGER","offers":[{"title":"Default Title","offer_id":48185766969563,"sku":"B004WDPZEW","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61jbjoqbpVL._AC_SL1000.jpg?v=1769650844","url":"https:\/\/gearmusthave.com\/products\/stinger-sgp35-500-amp-relay-and-isolator-heavy-duty-battery-control","provider":"GearMustHave","version":"1.0","type":"link"}