A "TING" Noise would possibly indicate a bi metallic overload fuse, these things are normally housed in a metal can roughly the length of a glass 3AG fuse and are normally used on 70/80's headlight circuits but have been used in aftermarket applications.
Id look around the right hand side battery and if you can take some photos of the drivers side of the engine bay and post them to the forum and perhaps we can spot the culprit.
It may be as simple as a separate fusible link for engine only.
Tony
Charleston Green 1997 TDi Disco R380
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