rear fog lights

[thebigone]

Hi folks, 02?1990 325i cab, have just fitted a OBC and all seems OK other than my rear fog dont work,
meter across ter on switch OK
power to switch OK
light in dash OK
power to lamps at rear ok
rear lamps OK
The two fuses in the box marked Left and Right OK and they do cut power to the front set.
and the relay is OK

So have I missed something or is there a second relay for just the rear set, I have also put a meter across all other fuses in the box.

Would putting the OBC in have done this, thank you

[Brianmoooore]

A meter on an unloaded circuit is next to useless. Use a 12V lamp of about 5W minimum. Spare front indicator repeater lamp and wire is ideal.
The other useful tool to have is a crocodile clip to go on the battery +, connected to a 15A fuse, and then to a long piece of wire with a bared end. You can use this to inject power where ever you want.
Also, don't forget the earth return is a part of every circuit.

[thebigone]

thanks for that