You will have to measure resistances. With a wire both ends discconnected there should be infinite resistance against ground. Taping is a good temporary measure. What to do in the long run depends if you want to keep the car and if you feel like it is worth replacing the bad wires.
Replaced some of the wires and checked for shorted wires.
The brown ground wire in the engine harness was patched up pretty bad. Replaced the wire from the position it had gone bad and naked to the place where it is grounded with the chassis.
The main engine ground cable is also in a very bad shape.
Just soaked it in kerosine. Seems will have to change it as well. But due to lockdown can't get my hand on ignition coil and other things. Will update as and when I make any progress or face a new problem.
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