Ford Iveco Euromidi

[Melkarth]

Hi I have a year 2000 ford Iveco Euromidi 30 seat coach with starting problems. I think the issue is with a couple of battery safety relays.

There are two black boxes, mounted by the batteries (2x12v) that used to click when switching the key. Now they dont make any noise but the electrics in the coach are completely dead, no dashboard lights, no ancillary equipment, nothing. Not even external lights. its almost as if an Isolation switch has been switched off. Batteries are good and charged.

Does anyone have any circuit diagrams for the battery / starter side of things. I would like to see how these supposed relays get involved in such things. Unless anyone else can provide any other ideas of course! The coach was working properly and was parked up after doing around 350 miles no problem. Then would not start again. (The 5.9L Cummins engine starts ok when jumped from a battery to the starter motor)

Thanks

Steve