I've recently spent some time pimping my ride. It's a 2004 TD5 Defender.
I've changed the front indicators to clear Britpart units, yellow bulbs supplied with the lenses.
On the first trip, using the indicators blew their fuse. Checking the hazzard lights blew that fuse. After changing the fuses and both blowing again, they have settled down with the third set of fuses and are working fine.
Now the indicators (all) do not flash on lock/unlock of the central locking and the siren sounds once on unlocking. I have read that this may be the fob batteries getting low?? All other fuses appear fine. I wondered if the new yellow bulbs were a different wattage and affecting the system; I've yet to check this. I may stick the original indicators back on to check.
Any ideas?