The voltage regulator protects the electrical system of the vehicle from damaging surges. The voltage regulator also prevents the burning of the lamps and makes sure that the battery is always kept fully charged. Due to the high operating temperatures created by this device, when it must be replaced, it is advisable to mount a good quality voltage regulator. Among the dozens of offers of our suppliers, we decided after a careful evaluation by our machine shop, to market the voltage regulator in question, because it felt very reliable and economical price. If you have any other doubt you can always contact us and we will be happy to help. Read below the applications for this article. Voltage regulator QINGQI Off Limit 4T 50 07/09 applications: