One of the key difficulties in car modification and repair is ensuring that your car is "street legal"--that is, it complies with all the standards and regulations for cars implemented and enforced by the U.S. Department of Transportation. Even a non-standard tail light can mean that your car can be taken off the road. With careful examination, however, ensuring your LED tail light meets government standards is a simple process.
Instructions
1
Go to an automotive parts store and examine the tail light you would like to install. The packaging will be clearly marked if the tail light is approved by the federal Department of Transportation. Also examine it for signs that it is a counterfeit part; such signs include misspellings on the packaging, bad grammar and incorrect contact information for the company. If you find signs of a counterfeit part, or no sign of DOT approval, assume it is not approved and investigate other brands until you find one that is DOT-approved and has no signs of counterfeiting.
2
Examine the specifications of the tail light and compare them to your state's specifications for tail lights. While it is likely the government and the state have very similar requirements, there may be subtle differences that may disqualify the light. If possible, ask to see a demonstration model of the part, or ask if there are cars at the shop with this tail light already installed so you can see it in action.
3
Install the tail light, and then test it to make sure it performs to both federal and state standards. Turn the wheel to the direction it is signaling in to see if it shuts off. Time the light to ensure it is not flashing too quickly, which may be a safety hazard for epileptic drivers. Ensure the light turns on and turns off smoothly with the use of the turn signal, and that it has been wired to the turn indicator on the dashboard. Look at the light at night and ensure it is bright enough to be seen but not bright enough to dazzle other drivers.
Tips & Warnings
Use only reputable auto parts dealers and installers. For local dealers, check sites like Yelp to find out more about their reputation and business. Local and national dealers will likely carry parts that meet state and federal standards.
Log on to the website of the company you are considering buying a tail light from. The site should note the part is DOT approved.
Counterfeit car parts are a major risk. If you have any suspicion that a part is counterfeit, do not install it.
Never install a car part yourself unless you know exactly what you are doing. If you are uncomfortable or uncertain, have a professional install it for you.
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