My 94 land rover discovery has a trailer light on even when off and keys out it is a 5speed how can I fix it

Hi welcome main problems are the abs valves causing the 3 dash lights (search 3 amigos online) a really badly sited compressor can cause air suspension models to fail giving the bags a slow leak the V8 is a solid engine but can have radiator expansion tank and cap failures
the other issue is electrics windows and door looms are problematic

A dealer replacement is the only option to reset the system and that is an expensive fix. You can buy a replacement fob online but be careful - it will need to be fully compatible or you run the risk of locking yourself out OR losing the central locking function.
I have no connection with this seller, but at least they make all the right noises:
https://www.keylessentryremotefob.com/Land-Rover-Key-Fob-Remote-s/1836.htm
Do more homework - especially on the specialist Land Rover forums before buying

Does the starter spin? Has the battery been load tested? Are the battery cables clean and tight on the the battery posts? Check all this and you will likely find one of them to be the problem.

The discovery is full time 4wd, you can change between high and low ratio, it sounds like a broken transfer case.

this is actually the internal DC motor which comes inside the door latch. Land Rover doesn't sell it separately. You need to buy the whole door latch to have this problem sorted out. or else you can buy the DC motor from me as I made a special order from a factory for those DC motors as they are common fault in most of new Land rover generation. each motor costs you $30 +shipping Regards..

water in the trailer socket

sounds like a faulty brake light switch which was commom on disco2

When i shut off my 94 Landrover Discovery, somethig is still running in the engine. Sounds like a low vavuum or something, but no fan blabes are moving. It makes that sound until the battery is drained. Do you know what it is and how to fix it?

it's not to bad since its four wheel drive but you definaltely need a lift. Just simple housing bolts, and converter bolts. Not too major with proper tools.

Had the same problem with my 03 Disco. Went through the usual, checking the fuses, etc. I went ahead and replaced my break light switch on the brake pedal. $15.00 fix, or I thought so; still had the problem! Took it in for repairs and found out it was fuses after all... To get the parking lock to disengage you need to pull of the housing, which is tough and then press in the locking pin at the base of the shift lever to shift out of park. you can do it with the engine running and it will drive just fine until you put it into park again. Check your brake lights if there is a problem. Could be a sign of the brake switch failure. In my case the lights were out, but a cheap trailer rental did the damage. The short in the trailer blew some fuses and it was a problem that cost me $60.00 at the repair shop....