Yes, you can start diesel engine even if you don't have battery in!
clicking noise when u turn the key to start is either a bad battery or bad battery connection or the starter needs replacing rule out the solenoid, as the clicking you can hear comes from the solenoid
The diesel battery is bigger as it take a lot more to get a diesel engine going. Best bet is to charge the diesel battery using the petrol, connect the 2 and leave the petrol engine running.
There could be many reasons why the vehicle won't start. The battery could be drained, there may not be connection on the battery post, there may not be a spark between the spark plugs, the starter could be going bad, or the solenoid may need to be replaced.
Check the battery cables or starter.
Mine Innova Diesel battery lasts for 48 months, the battery still can start the engine smoothly, but a little bit bulged, so I decide to change it.
need a lot more information that that does it have a battery, does it have a good battery does it have fuel etc just not enuff info to even start on that question
Jump start car and ensure alternator and battery are good.
Make sure connections are on tight.
what does it do
You need to replaced the starter or the alternator.
my 1999 wouldn't start. i replaced the battery cable and it runs now. i hope this helps