my dads 1800 escort ghia-x's heated windscreen is messing about,i cant hear a relay clicking anywhere for it but have 12v at the switch but no light comes on,i think the relays gone but have asked ford,consulted the haynes and the ford book and none tell me where the relay actually is,iv got the code of it so checked through witht he rest of them above the fusebox but none of the numbers match!

can anyone help please?

also the heated windscreen front /rear light comes on with the brake pedal-dodgy earth?where would i look for it


thanks james