My rear-light warning icon is on in my instrument cluster. After finding out it is due to my right brake light, I looked up for the replacement bulb. However, my lexus manual is wrong. It says it is 1156 bulb (which is '92-96' model year). When I went to walmart and looked up their book it says I need 7743 bulb.
However, all that they had is 7740, which looks exactly like my not-working-bulb. is there' a difference between 7740 and 7743? Can I use 7740 instead of 7743?
ANYONE knows?

 

NOBODY? come on over and pleeaze help a brotha out!

 

7443 to 7440 conversion

7443

Note: The 7443 led bulb will function in either 7443 or 7440 sockets. In the 7440 socket, the 7443 will have extra contacts that are not connected to anything. The 7440 will not function in the dual bright dim mode in the 7443 socket.

This can be seen in the wiring diagram below.



The 7443 is a dual contact (d.c.) bulb (Shown left). The dual contacts are connected to 2 separate circuits inside the bulb. One for bright or high beam (braking/turn signals) and one for dim or low beam (running/parking lights).

The 7443 has four separate wire contacts protruding from the bottom. If you examine the bulb closely, you can see that two of the wire contacts connect to the same point inside the bulb. These two contacts are the common negative (-) grounds.

7440

The 7440 is a single contact (s.c.) bulb. The 7443 led bulb can be used universally in either 7443 or 7440 applications. We usually ship 7443 bulbs, unless the 7440 bulb is specified in the order, to provide the greatest flexibility of application for the user.

In a very few vehicles, the low and high + Positive leads on the 7443 will need to be bent to the opposite sides so that the bulb will light on the brighter high beam circuit in the 7440 application. If not sure which 2 leads are the positive leads, just bend all leads around to the opposite sides. This will ensure that the high beam circuit connects to the high beam contact on the bulb. Use care when bending the leads and only bend one time to avoid breaking them off. The leads should only be bent one time.

The 7440 has two separate wire contacts protruding from the bottom. One of these two contacts is the common negative (-) ground. The remaining contact is the positive (+) side of the circuit. The 7443 extra contacts don’t connect to anything in the 7440 socket and the bulb will light high beam only.

 

Brake lights are 7743, it's a dual filament bulb. One filament is for night ligthts & the other is for when you apply the brakes. 7740 is a single filament for turning signals.