Bulb Holder Help!

Went to fix a front side light (UK term!) however the bulb will not illuminate once in the holder. Ive got a full 12v between the terminals, exactly the same as the other side of the car, but just won't come on. Tried new bulb, swapping from other side but nothing!

Any help?

http://www.ferrarichat.com/forum/attachment.php?attachmentid=2164751&stc=1&d=1448817438
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The tubular portion of the sockets often get corrosion preventing a ground connection.

Might try and clean it up some.

 

Thanks - Ive tried that and seem to get a reading from the earth wherever I touch it, whether at the top or within the slots. I'll give it another go though.

 

I discovered the same problem a couple of days ago. I cleaned it some and put the old bulb back in, it worked temporarily but the next day it was not working again. I used some Deoxit and put a new bulb in, it worked for a day but now today it is not working again. As suggested, I am going to give it a through cleaning.

I have had similar problems on old (1969) BMWs before. They can be frustratingly difficult to permanently fix in my experience.

 

This is not a meaningful measurement when the bulb is removed and the current is zero -- if there is a high resistance somewhere in wiring/connections, this will still measure +12V, but, when you add a current load, the voltage will drop to zero -- i.e., you really need to make the voltage measurement when the bulb is plugged in (which, I know, is not so easy to do).

Some figures describing this are in this thread:
http://www.ferrarichat.com/forum/technical-q-sponsored-algar-ferrari/56353-308-cooling-thermo-switch-problems.html

 

perhaps you're using right side bulbs😀

 

'79 GTS. I've had the same problems with mine. I discovered that the ground connection on the bulb housing/holder is terrible. On mine, it is a braided bare wire squeezed between the bulb holder and the light housing, this does not make a good connection. I'm going back in again to rectify this. Will probably run a new ground and solder it to the bulb holder.

 

Thanks for all the replies. Yes the earth was nothing more than exposed braided wire shoved under the tab of each bulb socket. Ripped that out and soldered new wires back to the terminal connection. All working fine now

Thanks again.

 

Thanks for that, very useful info.