Discovery 3 (2004-2009) Discovery 4 (2009-2016) Discovery 5 (2017-present) Problems with the Land Rover Discovery. Land Rover vehicles are not considered reliable, and for good reason. They are expensive to maintain, with many models requiring repairs once or twice a month. The second starter wouldn't crank because when the first one died, it dead-shorted and blew the 400 amp fuse between the positive battery terminal and the alternator/starter lead. That explains the clicking (the solenoid was activating but the starter couldn't spin). $11 and it's back up and running. Save. The alternator died on the Disco 4 in the snow, got it recovered to the dealership who have just quoted me £600 +VAT + labour to replace it! What's so special about a genuine LR alternator that makes it twice the price of a Denso alternator from a supplier? I wish I'd kept it on the driveway The voltage should be between 13.5 and 14.8 volts with the engine running. Switch on the accessories in your Discovery Sport, for example, headlights, AC fan at full speed, and interior lights. The voltage should remain around 14 volts. If it drops and remain below 13.5 volts, it indicates a problem with the current supply from the alternator. Off would make voltage be regulated to a steady 14.7v (approx) at all time regardless of engine load. When I first purchased the car the voltage varied. I can see this as my Tyre Pressure Monitor has a voltage display. Then after about 12 months the starter battery failed. LR replaced the battery under warranty. I have a 1996 Land Rover Discovery. just recently I had an electrical problem first the battery seemed to die and/or the alternator wasn't working. I am a pretty decent mechanic so I tested the alt. w … if an alternator has failed it can take the battery with it. would also ensure the alternator connections are nice and tight and at the battery and the earths. The alternator will output up to around 15.5 volts. with the engine running , out everything on, screen, etc and see if the pulsing stops. In this video we are checking to see if the alternator is charging correctly/ We will be showing you have to check for voltage drop in the cable to ensure t Jpor.