Anyone know the difference between the ones in the engine bay and the ones in the driver footwell? They look the same and a quick test showed them seem to operate the same as well. The only difference i can see is that one is "no 137" and the other is "no 13D". Maybe the diode on the inside is in a different place or somthing else.....

 

diode is to ensure the relay switches cleanly (rather than 'chattering' due to back-EMF... or something like that)

aslong as the pins and amperage are correct it should work fine!

edit: thinking about it, i thought it was a capacitor and not diode.... it is still todo with make/break of the circuit cleanly though