Hi, there are two round black multi plugs in the floor of the cab, if you can tilt the cab, have a look to make sure these are properly connected. you could also check the wiring to the alternator as it actually forms part of the ignition circuit. have you got a battery isolator fitted? if so try to bypass it just incase its not working properly (this is exactly what happened to my 87 cargo)
Pat
May 2010