thanks Armoore for your comments. I have found the third relay of the bank of 4 on the bulkhead not to have 12v present on pin 30 the live feed to the relay . What is strange according to a wiring diagram (not sure if it correct) shows all four feeds to the bank of relays from a common source. with no voltage present only one relay I could assume there is an in line fuse . I have continuity checked all four fuses on the bank of relays and all read Ok.
Perhaps I should try to find correct wirring diagram. or tell me if there is a finline fuse and where it is located ?
Anyone else had this problem