General relay questions - DME

[Alpinerob]

Are all of the 4 prong relays compatible with one another? same for 5 prong? are orange relays different than say the white or blue?

if not, is there another relay I can swap in for my main dme relay? I dont have tools to test these, so im trying to see if I can swap a few around

[jlevie]

The main relay is special in that it is a five pin type. The O2 heater and fuel pump relays are four pin type and are interchangeable. You can use a five pin relay for the O2 heater and fuel pump and must use a five pin for the main relay.