{"product_id":"h4-9003-hb2-lamp-socket-adapter-wiring-harness-female-plug-connector-4pcs","title":"H4 \/ 9003 \/ HB2 Lamp Socket Adapter Wiring Harness – Female Plug Connector Extension Cable (4 Pcs)","description":"\u003ch2\u003eH4 \/ 9003 \/ HB2 Lamp Socket Adapter Wiring Harness – Female Plug Connector Extension Cable (4 Pcs)\u003c\/h2\u003e\u003cp\u003eA set of 4 H4 \/ 9003 \/ HB2 lamp socket adapter wiring harnesses with female plug connectors and extension cables. Used for headlight bulb socket repair, HID\/LED conversion harness adaptation, and headlight wiring extension on vehicles using the H4 \/ 9003 \/ HB2 bulb standard.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulb Standard:\u003c\/strong\u003e H4 \/ 9003 \/ HB2 (all three designations refer to the same bulb type)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePin Count:\u003c\/strong\u003e 3 (high beam, low beam, ground)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGender:\u003c\/strong\u003e Female socket (plugs onto H4 bulb base)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire Gauge:\u003c\/strong\u003e 18 AWG (0.5 mm²)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire Length:\u003c\/strong\u003e Extension cable included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e PA66 nylon (heat-resistant)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Material:\u003c\/strong\u003e Copper alloy, tin-plated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Rating:\u003c\/strong\u003e Up to 15A per pin (suitable for 55W\/60W H4 halogen bulbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e 4 pcs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eH4 \/ 9003 \/ HB2 – Same Bulb, Three Names\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eH4:\u003c\/strong\u003e European ECE designation (used in Europe, Asia, Australia)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9003:\u003c\/strong\u003e SAE\/DOT designation (used in North America)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHB2:\u003c\/strong\u003e ANSI designation (used in technical specifications)\u003c\/li\u003e\n\u003cli\u003eAll three designations refer to the identical dual-filament bulb with the same 3-pin P43t base\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHeadlight bulb socket repair – melted or corroded H4 socket replacement\u003c\/li\u003e\n\u003cli\u003eHID xenon conversion harness – H4 to HID ballast adapter\u003c\/li\u003e\n\u003cli\u003eLED headlight conversion – H4 LED bulb socket adapter\u003c\/li\u003e\n\u003cli\u003eHeadlight wiring extension – additional cable length for custom installations\u003c\/li\u003e\n\u003cli\u003eUniversal fit for any vehicle using H4 \/ 9003 \/ HB2 headlight bulbs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eH4 Socket Failure – Common Causes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMelted socket:\u003c\/strong\u003e Caused by loose terminal contact creating resistance heat – replace socket immediately to prevent wiring harness damage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorroded terminals:\u003c\/strong\u003e Moisture ingress causes green oxidation on copper terminals – clean with contact cleaner or replace socket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntermittent headlight:\u003c\/strong\u003e Loose terminal in H4 socket – wiggle test confirms socket fault\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Are H4, 9003, and HB2 the same bulb socket?\u003c\/strong\u003e\u003cbr\u003eA: Yes. H4 (ECE), 9003 (SAE), and HB2 (ANSI) all use the identical P43t 3-pin base. This adapter is compatible with all three designations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I use this adapter for LED headlight conversion?\u003c\/strong\u003e\u003cbr\u003eA: Yes. This H4 socket adapter is compatible with H4-base LED headlight bulbs. Ensure the LED bulb's power draw does not exceed 15A per pin.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Why does my H4 socket melt?\u003c\/strong\u003e\u003cbr\u003eA: H4 socket melting is caused by loose terminal contact. A loose terminal creates resistance, which generates heat proportional to current × resistance. A 55W H4 bulb draws approximately 4.6A – even 0.5Ω of contact resistance generates 10.6W of heat at the terminal, sufficient to melt the PA66 housing.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cp\u003e4 × H4 \/ 9003 \/ HB2 Female Lamp Socket Adapter with 18 AWG extension wire\u003c\/p\u003e","brand":"Cable Parts Online","offers":[{"title":"3P \/ Female with Wire \/ China Mainland|Line Connector|1 Set","offer_id":47844208181493,"sku":"14:200004889#Female with Wire;200001249:202408830#1 Set;200007763:201336100;200497261:200025004;462:203053809","price":17.1,"currency_code":"USD","in_stock":true},{"title":"3P \/ Female with Wire \/ China Mainland|Line Connector|3 Sets","offer_id":47844208214261,"sku":"14:200004889#Female with Wire;200001249:202408832#3 Sets;200007763:201336100;200497261:200025004;462:203053809","price":51.15,"currency_code":"USD","in_stock":true},{"title":"3P \/ Female with Wire \/ China Mainland|Line Connector|10 Sets","offer_id":47844208247029,"sku":"14:200004889#Female with Wire;200001249:202408829#10 Sets;200007763:201336100;200497261:200025004;462:203053809","price":170.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0732\/3494\/0149\/files\/Sabfbf3efc4d8428fa40a8985d13ceffde.webp?v=1773810226","url":"https:\/\/www.csldmcml.com\/products\/h4-9003-hb2-lamp-socket-adapter-wiring-harness-female-plug-connector-4pcs","provider":"Cable Parts Online","version":"1.0","type":"link"}