relay 30 help

[stuyhird]

Car 96p golf gti 8v.
Sorry, but at the risk of being dim but.........  i have a cutting out problem and been told to change the coil and relay 30, top row 3rd from the left i was told, ok, when i looked the relay in the car was 2nd from the left and the relay is white? the new relay is black.

Is this correct?  should i just change it and be done with it?

Thanks Stuy

[boneybradley]

try this link for factory diagram of fuse box

http://www.golfgtiforum.co.uk/index.php?topic=74087.0
(location no3 on the top picture for the ecu relay and should have 30 printed on it, the white is no72 and controls the rear wiper etc)