Hi you clever lot. Again my car ceases to astound me. It has had a new alternator then the brake light switch went and now the dif lock light comes on every now and then. It is of the age (2000 w reg) that had them fitted well part anyway. Could I have a Wiring fault or issue somewhere. It is probably a common thing. Looking in the Haynes manual the f25 fuse via a resistor goes to the diff lock switch. My question is , is the diff lock coming in and out willy nilly a wiring fault or what. Any thoughts would be appreciated