All the T10 wedge bulbs that I have bought (from different vendors) have been non-polarised, so they work first time. Now anything smaller, such as B8.5D or T4 is polarised, so they only work one way. And for some of the applications, you don't know until almost everything is put back together. And they don't seem to have any markings to say which side is positive or negative. None of the pricks selling you these things tell you that they are polarised.
- posted
6 years ago