Landrover not starting

Check main battery leads also check connections (negative connections to chassis) also check main plug to ECU ( disconnect battery before plug removal) when plug is removed check that there is no corrosion on pins spray WD40 in socket and plug and put a little grease around rubber seal and carefully replace plug ( the grease will help seal plug against moisture and water) if all the connections are ok try wiggling loom around starter motor and main fuse board as you may have a broken wire wiggling loom may give you an idea of area loom may be damaged have ignition on and a helper in driving seat when wiggling so as they can tell you if ignition lights flash or go out
hope this helps

post is good and clear, no engine size stated.>>>
can you jump start it?//
this simple check proves battery is good /bad or just discharged.
yes, jumps and runs. (ever clean the battery lugs ever?
if it jumps the battery is bad/or disharged, so charge it.
no, wont jump cold
bad starter. or funky key line.

1: i hot wire these starters,
cranks ok, good starter.
no crank bad key line
if key line is dead, well wiggle the key and wiggle the gear shifter.
is car a A/T or M/T.
if M/T wiggle the clutch.
now you have your answer, an why. how is a differnt horse.

Don't assume your battery is fine. Just because it measures 12-13 volts doesn't make it fine. You need to test it under load and see if it holds 12-13 volts under load. If you don't have the instruments to do that, try jump starting the car with cables connected to another running car. If it starts normally, your battery is bad. If it continues to "click", you have a dirty connection in the battery wire circuit. Remove, clean, and replace the terminal connections.

have you got the starter wire from the key on the right connector of the starter motor.

Bad ignition switch or bad connection. Wiggle the ignition switch next time you get nothing if it comes to life the problems the switch also check the connection from battery to engine juction fuse box

when it does it the next time take the key out every time you try to start it and it dosent start. It could be the ignition switch not the key. And if it starts sooner by removing key then you have an idea where to start.

just take it to a battery outlet were they sell you batterys for your car and for everything else dont do it your self you can break it or damge the parts inside the key

if it is a mems unit , it will need to be programed to the key fob and alarm . (there is no way round it).

This usually is the starter, especially if your truck has had an oil leak going for a while as the oil will run down into the starter and cause it to intermittenly fail. Also check your battery terminals and make sure you have a good connectivity.

Bad battery cable connections (loose/dirty). Starter (stuck/dead). Only going by what you wrote, could possibly be engine (seized). I hope not! Most likely it's bad cable connections. Best wishes. Hope that I helped.