This 12V starter solenoid relay is specially designed for the 2005 Polaris Sportsman 500 HO ATV. It replaces OEM part numbers 4010990 and 4012001 with identical size and connector layout for plug‑and‑play installation.Constructed with a heavy‑duty coil and premium contacts, it ensures stable power delivery to the starter motor while resisting heat and wear. The sealed housing offers strong protection against water, dust and vibration in harsh off‑road conditions.It effectively fixes common starting failures and restores reliable ignition performance, making it a durable and cost‑effective repair part.