{"product_id":"konnwei-kw371-battery-relay-tester-6v-12v-24v-4-5-pin-relay-cca-ah-readouts","title":"KONNWEI KW371 Battery \u0026 Relay Tester — 6V\/12V\/24V, 4\/5‑Pin Relay, CCA\/Ah Readouts","description":"\u003cp\u003e\u003cstrong\u003eThe KONNWEI KW371 is a portable 2-in-1 automotive diagnostic tool that tests 6V\/12V\/24V batteries and verifies 4-pin\/5-pin relays to quickly identify battery, starter, alternator, or relay faults.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe KW371 combines broad battery compatibility with relay diagnostics and cranking\/charging analysis in one handheld meter. It supports Lead-Acid, AGM, Gel, EFB, and Lithium chemistries across 6V, 12V, and 24V systems and reads CCA, Ah, and multiple international standards. Its waveform display and clear result wording make it useful for professional garages, fleet operators, and experienced DIYers who need fast, reliable on-vehicle diagnostics without removing components.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the KW371 determine if a battery needs replacing?\u003c\/h3\u003e\n\u003cp\u003eThe device performs a battery health test that reports state of health (SOH), state of charge (SOC), internal resistance, and voltage. It compares measured results to standards (CCA, EN, DIN, JIS, etc.) and offers a clear pass\/fail suggestion—Good Battery, Replace, Bad Cell, or Charge Retest.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeasures 10–2000 CCA and 5–220 Ah ranges\u003c\/li\u003e\n  \u003cli\u003eSupports multiple battery chemistries and international standards\u003c\/li\u003e\n  \u003cli\u003eDisplays internal resistance and SOH percentage for informed decisions\u003c\/li\u003e\n  \u003cli\u003ePowered directly from the tested battery—no internal batteries required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat tests reveal starter or alternator problems?\u003c\/h3\u003e\n\u003cp\u003eUse the KW371’s cranking and charging tests to isolate starting and charging system faults. The cranking test records minimum and maximum voltage and cranking duration in milliseconds, while the charging test checks unloaded and loaded voltages plus ripple, helping distinguish between a weak battery, failing starter, or an alternator that’s not regulating properly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCranking test: minimum\/maximum voltage and cranking time\u003c\/li\u003e\n  \u003cli\u003eCharging test: loaded\/unloaded voltage, ripple detection\u003c\/li\u003e\n  \u003cli\u003eGraphical waveform shows real-time voltage behavior under load\u003c\/li\u003e\n  \u003cli\u003eQuickly indicates whether issues are battery-, starter-, or alternator-related\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the relay tester work and why is it useful?\u003c\/h3\u003e\n\u003cp\u003eThe integrated relay tester checks 4-pin and 5-pin automotive relays to detect coil faults, sticking or worn contacts, and incorrect switching without removing the relay from the vehicle. It saves time by identifying faulty relays in-place—useful when troubleshooting lighting, fuel systems, cooling fans, or accessory circuits.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTests both 4-pin and 5-pin relays for coil continuity and contact operation\u003c\/li\u003e\n  \u003cli\u003eDiagnoses relay faults without disassembling the fuse box\u003c\/li\u003e\n  \u003cli\u003eReduces diagnostic time for intermittent electrical faults\u003c\/li\u003e\n  \u003cli\u003eIdeal for mechanics, fleet techs, and advanced DIY troubleshooting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy and safe is it to use in the field?\u003c\/h3\u003e\n\u003cp\u003eThe KW371 was built for practical, on-vehicle use: rugged alligator clips connect directly to the battery, eliminating the need for internal batteries. The interface provides multilingual menus, polarity reverse protection, and a graphical display so results are easy to read in a busy workshop or roadside scenario.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMultilingual menu including English, Spanish, French, and more\u003c\/li\u003e\n  \u003cli\u003ePolarity reverse protection protects the unit and user from incorrect hookups\u003c\/li\u003e\n  \u003cli\u003eUSB connection for Windows PC updates and printable reports\u003c\/li\u003e\n  \u003cli\u003eDurable clips and casing for garage or field use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The KONNWEI KW371 suits professional mechanics, fleet and RV\/boat managers, and knowledgeable DIYers who need a single handheld tool to diagnose batteries, starters, alternators, and relays across 6V\/12V\/24V systems. It’s especially valuable where quick, reliable on-vehicle testing and international battery standard support are important—repair shops, roadside assistance, and maintenance fleets will find it saves diagnostic time and reduces parts guessing.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the KW371 test lithium batteries and AGM types?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The KW371 supports Lead-Acid, AGM (flat and spiral), Gel, EFB, and Lithium chemistries across 6V, 12V, and 24V systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can it identify alternator problems or only the battery?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It runs cranking and charging tests including ripple detection, so it helps distinguish battery issues from alternator or starter faults.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"KONNWEI","offers":[{"title":"Default Title","offer_id":48079909159070,"sku":"B0GWQN5NS2","price":99.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/konnwei-kw371-front-display.jpg?v=1785775323","url":"https:\/\/northtrailauto.ca\/products\/konnwei-kw371-battery-relay-tester-6v-12v-24v-4-5-pin-relay-cca-ah-readouts","provider":"North Trail Auto","version":"1.0","type":"link"}