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Are 7440 and 7443 l.e.d bulbs the same or different?
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.
The 7443 is a dual contact (d.c.) bulb. 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 7440 is a single contact (s.c.) bulb. The 7443 led bulb can be used universally in either 7443 or 7440 applications.
so the 7743 will work in place of a 7740.
a 7740 will not work in place of the 7743
hope that helps
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