Disco fuse 3....

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Paxmanmerv

Paxmanmerv

Active Member
Posts
167
Location
Bredon Hill.
A very good evening to the Discovery 2 collective geniuses!
No doubt this has been covered many times before, but after trawling through the first 20 pages on the discovery forum i was suffering from tunnel vision.
Got an odd one here. Changed the transfer box & since then the instrument lights keep blowing fuse 3. this is probably purely coincidental (i hope) but there is a problem.....
Fuse 3 has a book sign on the fuse box. Presumably this fuse runs more than just the instrument lights as it is a 10 amp fuse. Any ideas as to a common fault? is it a Discovery enigma? should i put a 50 amp fuse in & see where the smoke comes from then follow the wire to the cause? (bit drastic).
All ideas welcome!
Thanks all in advance.
 
Thats what i thought but didnt disturb wires during the change. was wondering what else fuse 3 controls incase i upset something there. Sadly the fuse legend only shows a book....... Book? Eh? Disco 2 supposed to have a book?....
 
Reet then! Seems that fuse 3 in the passenger compartment (by the drivers knee) runs the instrument lights & probably something else. Would be surprised if a transfer box change would cause instrument lights to blow a fuse.... unlike my bank manager who seems to blow a fuse quite regularly! so my guess is that its the something else that is giving me grief....
 
Thats what i thought...... has thrown me with this damned fuse blowing & the instrument light going out. Obviously the instrument light power comes from somewhere but would have thought it would be side lights rather than headlamps..... You see my dilemma....
 
for the time being i'm having a dillema too cos you didnt explain well what's going on, i mean how is that fuse blowing and when, as you put it in, immediately as you turn on the lights on or after a while, on any position of the stalk, etc... describe the symptom exactly if you want me to be able help
 
Start with new fuse & set off. Main beam, low bean, turn left & right, smooth road, bumpy road, then maybe 20mins, an hour, 2 hours later the fuse goes. No rhyme or reason but it happens.
 
that's all? that's EXACT description? ... then why did you mention the instrument lights? ... and which ''instrument lights''? the instument pack illumination or the warnings or which ones... do you loose LH main beam when this happens? i want to help you but if i dont have all the info i can't cos electrics troubleshooting in odd situations is not easy without ALL the elements, also while the fuse it's still good select high beam and see if the LH headlamp light is not by any chance weaker than the other
 
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OK. This morning at 0530 a new 10A fuse was fitted to position 3. The entire electrical system appeared to functioning correctly. Exactly 17 minutes later, the instrument binnacle illumination ceased to function. At the same time all the illuminated switches lost their lights. This included the illuminated switches in the centre console that control the windows. All other electrical systems still appeared to be functioning. All the exterior lights were functioning as expected. The interior lights were functioning as expected. All warning lights on the instrument binnacle were functioning correctly.
As i said earlier, fuse 3 has a book symbol. The Left main headlamp fuse is number 5.
sierrafery said:
F3 interior fusebox is for LH headlamp main beam nothing else
Click to expand...
 
Looking at the wiring diagrams in RAVE, the dashboard lighting; switches and things are wired through a fuse F11 (10 amp) feeding "header 286" which appears to be the point where all the lights join together.

Since the trouble seems to have started after the transfer box was refitted then as has been said already that's a good place to start. You'd be looking for a wire, probably coloured red with a brown tracer which has been accidentally damaged and is shorting to ground. It might be actually broken and the end just happens to touch some metal or it might be jammed between some parts. The sort of place you might not have looked yet could be under the centre console; loads of wires including the ones you want and somebody has already been in there with some spanners.

In some cases, the numbering of the fuses on the board can differ from those shown on the diagrams for some unknown reason.
 
Paxmanmerv said:
OK. This morning at 0530 a new 10A fuse was fitted to position 3. The entire electrical system appeared to functioning correctly. Exactly 17 minutes later, the instrument binnacle illumination ceased to function. At the same time all the illuminated switches lost their lights. This included the illuminated switches in the centre console that control the windows. All other electrical systems still appeared to be functioning. All the exterior lights were functioning as expected. The interior lights were functioning as expected. All warning lights on the instrument binnacle were functioning correctly.
As i said earlier, fuse 3 has a book symbol. The Left main headlamp fuse is number 5.
Click to expand...
Don't tell me you are speaking about position 3 of the right column or from down-up, which is F20(the fuses have the numbering too on that scheme).

tell me from the picture which fuse F3 or F20?

interior fusebox.jpg
 
Thanks for that Gents!
Brian, Have had a look at the centre console wires, will have a further more indepth look at the weekend. Seems a logical approach.
Sierraferry, Have been saying fuse 3 as it is marked up F3. Have tried to upload a picture of the fuse legend in the car put the server keeps saying its to big. Will happily email you the pic if you want, just PM me your email address.
 
So is it F3 like in the picture above too? , send me the pic you have PM, now i'm really intrigued...maybe you missed one 3 from F33 cos that would be the suspect one
 
Got it, yes. that's really odd, they say to look in the book but in the book(RAVE) F3 is for LH main beam only IN ALL related data(description, diadram, layout)... i'll think about that but as said if we take into account that work was done under the center console it's possible that there to be a problem, if you can't find any visual sign of chaffed wirring there unfortunately you'll have to cut a wire to rule out that side of circuit so as desperate action expose header C0761 and cut the red/brown wire from pin 19(make sure that it's the wire which goes toward the dash to not be some mistake in RAVE about the pin disposals too)... if the fuse will not blow this way we are closer to the answer

C0761.jpg
 
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Strange thing is if you look at the pic i sent, you will see the L/H main beam is in the right hand stack of fuses. Can you sort of understand my confusion now?.
 
I'm even more confused than you, i'll check on mine tomorrow to see if it's the same or not, ... a real mess anyway, let's hope at least the wiring diagram is good( is your's facelift or early type)
 
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