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It's not original, it's a Sony aftermarket head unit, I will try to sort it out or replace it, it's not too much of an issue though.

Just bought a new fusible link, to replace the blown one, started the car: no battery light, 14.2v, Windows, wipers and blowers working are now working :D, only the radio doesn't, but that's no big deal. Very fortunate that this was such a simple fix, thanks for all your help, really appreciate it.

Just changed this threads name, since the flat battery was not the issue ;). Also just had a look at some wiring diagrams for the discovery, although they're not for the same model year, after looking at the radio, window, wipers and heater circuits they all seem to use FL1, so maybe replacing...

Just got a multimeter and have been doing some testing, battery voltage with engine off is around 12.5v, with engine running it is around 12.1v. It seems FL1 has blown, no continuity. FL7 seems fine, continuity and low resistance and R7 also seems fine. Could FL1 cause the alternator to not work?

Just swapped R7 with R6, unfortunately no change, and the glow plugs still came on so both relays must be fine. Thanks

Just had a look, FL7 looks fine, but can't be sure without a meter, this discovery doesn't have an R8 relay, as it doesn't have a heated front windscreen, can I swap R7 with any others?

Ok thanks, I shall do that tomorrow when i get a meter, ill check all the fuses for continuity and resistance.

Thats strange as when I replaced the fuses the car then went back to normal, as in the key fob worked again, the B with the cross didnt appear and the car started. Any idea on what is causing the windows, wipers, blowers and radio to not work?

F13 and F4 in the engine bay were blown

The fuses that were blown were F13 and F4, replaced both and have also replaced F24 and F27, which made no difference. Haven't checked FL1 or battery voltage with engine running as I don't have a multimeter, will get one tomorrow and test both. Thanks

Went again to try and start the discovery, I thought I'd try and put the good battery back on. However as it was dark and cold last night, it seems I stupidly must have connected my spare battery the wrong way round, thankfully the loud horn meant it wasn't connected for long. So I checked fuses...

Thanks for the quick replies, I agree that the battery could be knackered, as it has gone flat quickly before. is there anyway to prevent the horn sounding if I connect the good battery back up?

Hi, My mums 1999 TD5 discovery's battery died tonight whilst she was at work, so I went to try and get it started. I decided to swap over the dead battery with a spare I have, so I took off the dead battery and as I touched up the good battery, the horn sounded, bearing in mind it's 11 at night...