Fourtrak

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Has anyone any experience of a sudden loss of 4wd on a FourTrack please?
It has simply ceased to operate. Normally one presses the switch , the dash light comes on and the 4wd engages. Now, no light, no 4wd.
There IS power to the switch , both in and out, but as I don't have a wiring diagram diagnostics is a nightmare.
Anybody any idea what might be the problem/ You can e-mail me at eval(unescape('%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65%28%27%3c%61%20%68%72%65%66%3d%22%6d%61%69%6c%74%6f%3a%63%6d%65%32%35%30%40%61%6f%6c%2e%63%6f%6d%22%3e%63%6d%65%32%35%30%40%61%6f%6c%2e%63%6f%6d%3c%2f%61%3e%27%29%3b')) if you can help me.