A friend has a R-reg Mitsubishi Shogun 2800. The battery is in good condition, but after leaving the vehicle parked for more than about 20 minutes he returns to find the battery flat. Investigation has shown that this is because the glow-plugs are remaining connected, and his temporary solution is to disconnect the battery whenever he parks up. The local Main Dealer says that the problem lies either with the glow-plug relay (costing about £100) or with a control box (costing about £700). Is there anyone here with experience of this problem and can say whether the fault is likely to be within the relay or control box (which?), and whether a repair might be possible.
TIA of any replies. DB.