The difference in brightness you are experiencing could be from several causes. Could be a better electrical
contact in one socket, or it could be a mismatched bulb (there are several other bulbs, with different numbers, which will still fit in the socket and work...they just may not be the right bulb for the application.)
The easiest way to tell which one you need is to look at the base of the bulb. If the base has just one
soft lead gray tip it is a single filament bulb. This can also be visually checked and verified by looking through the glass globe of the bulb and confirming that it has only one filament. The single filament bulb you want to use (if it is a single filament) is the number # 1141
. Any other number is not the correct bulb and should be replaced with the #1141.
If the bottom of the bulb's base has two
soft lead gray tips, and inside the glass globe it has two separate filaments, it is the bulb that controls your lights/brakes/turn signals. This is usually the most common bulb to burn out. Again, there are several bulbs made with two filaments which will fit the socket, but the one you want (for two filaments) is an #1157
. Any other numbered bulb is not the correct one for the application, and should be changed to this one.
If the bulb(s) you currently have installed are not one of these two, respectively depending on the socket, then they are not the right ones. Use only the 1141
(single) or the 1157
(double) and you will have the proper light
intensity for the intended purpose.