{"product_id":"metra-tuner-relocation-harness-gm-multi-kit-clean-oem-integration","title":"Metra Tuner Relocation Harness + GM Multi Kit - Clean OEM Integration","description":"\u003cp\u003eIn this review the Metra 70-1857 tuner relocation harness bundled with the Metra 99-2011 GM multi kit is evaluated for installers who want to fit an aftermarket radio into 1990-up GM vehicles while retaining Bose amplifier functionality. The single biggest reason to buy this pair is the direct integration: the harness lets an installer relocate or bypass the factory tuner and interface cleanly with the Bose amplifier, while the multi kit secures single DIN or double DIN units for a factory-like installation. It is a practical choice for DIY enthusiasts and professional installers who prioritize compatibility and a tidy install.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTuner bypass harness:\u003c\/strong\u003e provides a 17 ft long connection that eliminates the factory tuner and allows the aftermarket radio to interface with the vehicle's Bose amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBose amplifier integration:\u003c\/strong\u003e maintains preamp and speaker-level connections so the vehicle amplifier continues to power speakers without losing audio functionality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti kit fit:\u003c\/strong\u003e secures both single DIN and double DIN radios for 1990 and newer GM vehicles, helping achieve a factory-look dash installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower and preamp connections:\u003c\/strong\u003e plugs into the car harness at the radio location to simplify wiring and reduce the need for cutting stock wires.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA multi kit:\u003c\/strong\u003e the multi kit is manufactured in the USA and ships in a compact package, offering reliability in components and mounting hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis bundle is aimed at car audio installers and experienced DIYers who are upgrading GM dashboards and need to preserve the vehicle's Bose amplifier while using an aftermarket head unit. It suits projects where maintaining factory amplifier power and preamp outputs is important for speaker performance.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for vehicles that do not use Bose amplifiers or for users who expect a plug-and-play radio with every adapter included; some vehicles may require additional adapters or trimming for perfect fit, and customers sensitive to possible wiring noise should be prepared to test ground and routing to minimize engine or electrical interference.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePreserves Bose amplifier function so speakers remain amplifier-driven with an aftermarket radio.\u003c\/li\u003e\n\u003cli\u003e17 ft harness length offers flexibility in routing and allows relocating the tuner where needed.\u003c\/li\u003e\n\u003cli\u003eMulti kit secures both single DIN and double DIN radios for a neat, factory-style finish.\u003c\/li\u003e\n\u003cli\u003eMany customers report easy installation and solid build quality for the harness and kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWire length feedback is mixed; some users find the harness very long while others worry about excess wiring management.\u003c\/li\u003e\n\u003cli\u003eThere are reports from some customers of noticeable noise if grounding or routing is not optimized.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBundle components\u003c\/td\u003e\n\u003ctd\u003eMetra 70-1857 harness and Metra 99-2011 GM multi kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHarness length\u003c\/td\u003e\n\u003ctd\u003e17 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle compatibility\u003c\/td\u003e\n\u003ctd\u003eSelect GM vehicles 1990 and newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier support\u003c\/td\u003e\n\u003ctd\u003eBose amplifier integration, preamp and power pass-through\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMulti kit dimensions\u003c\/td\u003e\n\u003ctd\u003e8.1 cm x 27.7 cm x 17.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMulti kit weight\u003c\/td\u003e\n\u003ctd\u003e0.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturing\u003c\/td\u003e\n\u003ctd\u003eHarness manufactured in China; multi kit made in USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Metra 70-1857 harness paired with the 99-2011 GM multi kit is a pragmatic, cost-effective solution for anyone installing an aftermarket radio in a GM vehicle equipped with a Bose amplifier. It preserves amplifier-driven speaker output and provides flexible routing with a long harness, making it good value for DIYers and pro installers who want a clean, factory-style result while accepting the need to manage wire length and ground routing to avoid occasional noise.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this work with any GM vehicle?\u003c\/strong\u003e\u003cbr\u003eIt is designed for select GM vehicles 1990 and newer; compatibility depends on the vehicle's audio wiring and Bose amplifier setup, so confirm fit before purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the harness keep the Bose amplifier functioning?\u003c\/strong\u003e\u003cbr\u003eYes, the harness is made to interface with the Bose amplifier, maintaining preamp and amplifier power so speakers remain amplifier-driven.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre there installation issues to watch for?\u003c\/strong\u003e\u003cbr\u003eSome users report mixed experience with harness length and occasional engine noise; careful routing, grounding, and trimming excess wire help avoid interference.\u003c\/p\u003e","brand":"Metra","offers":[{"title":"Default Title","offer_id":48612097491163,"sku":"B0C3BFNBK8","price":47.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/41jWhVP41yL._AC_SL1001.jpg?v=1778371173","url":"https:\/\/gearmusthave.com\/products\/metra-tuner-relocation-harness-gm-multi-kit-clean-oem-integration","provider":"GearMustHave","version":"1.0","type":"link"}