3157 Selection and Installation Tips
Which 3157 Leds Should I get?
For best results, match the led color to the lens color (ie: use red leds in red lenses, amber leds in amber lenses and white leds in clear lenses.
Led brightness and performance will vary depending on the housing and lens design. Leds are not always brighter than stock glass bulbs. For best performance in most housings, use the tower style leds. The more expensive ones are brighter.
Leds are preferred ,mainly for the vivid colors, low current draw (power consumption 90% less than glass bulbs) and instant on capability. The instant on and off capability can be quite dramatic at highway speeds for brake and turn signal detection at higher speeds.
Check here for the stopping distance comparisons for led bulbs compared to incandescent bulbs:
Which Type of 3157 Sockets do you Have?
Most vehicles will require a conventionally wired 3157 led bulb. If you are not sure, you may have to use an ohmmeter meter to check which two terminals in your socket are connected to the - Ground.
As you can see in the image to the right, a conventionally wired socket will have two - ground contacts positioned on either side of the wedge base. If your socket is wired this way, use the conventionally wired 3157 led bulbs.
There are some vehicles which are wired in a non-conventional manner. These are wired in a "CK" manner. As you can see in the image to the right, the CK sockets have the two - ground contacts side by side on the same side of the wedge base. If your socket is wired this way, you will need to use the specially wired 3157 CK bulbs.
|3157 Led Conventional Wiring||3157 Filament Bulb Wiring||3157 Led CK Wiring|
Note: Use Special 3157-SRCK (Red) or SACK (Amber) bulbs to replace the center tail lamp bulbs on these and other vehicles:
and Toyota Tundra front turn signals
Use the regular 3157 bulbs for the top tail lamp bulb.
How to determine if the bulb is faulty or the vehicle circuitry is just not functioning with the led bulbs in place.
Installing led bulbs is not always a "plug and play" operation. Although we have devised our patented circuitry with as much logic as possible to allow it to plug and play in many vehicles, it is not possible to design the 3157 led bulbs to plug and play in 100% of all vehicles.
In order to properly diagnose and fix problems, it is essential to isolate bulb related problems from circuit related problems. It is never a good idea to plug and led bulb into a vehicles circuit to test the led bulb. This is testing both the led bulb and the circuit at the same time. This method of testing will make it impossible to isolate problems with the bulb from problems with the circuit.
It is always recommended that if the bulb is not working in the circuit, test the led bulb using two wires connected direct to battery or any other known 12 volt DC power source. This is the only way an led bulb can be isolated from the circuit related problems and properly tested.
How to fix circuit related problems.
OK you plugged your new led bulbs in and they "don't work". The bulb must be defective, right? WRONG!
First... Did you test the bulbs as described above? If not, you need to test the bulbs only. Use the diagrams shown above to test the bulbs. It is best to use two wires that are connected direct to battery to test the bulbs. If you did not test the bulb as prescribed, you will never figure out if the problem is with the bulb or the circuit or the installation. Never assume the bulb must be bad. 99.8% of the time, the led bulbs are working as they should, but the circuitry is just not set up to operate properly with an led bulb. The odds that you received a non-functional LED bulb is very unlikely....less that 1 in 500.
99% of the time, the circuit related issues can be overcome, but it may take some extra effort and/or some minor wiring changes to get the 3157 led bulbs to work in some vehicles.
Here is a list of some common symptoms and fixes for automotive circuitry:
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