Missing earth on cooling fan relay
Discussion
Which fan relay are you referring to?
Some have just one relay some have two.
But in each case the earth path for the relay coil is the otter switch so is not an earth internal to the fusebox.
Come back and I can give you wire colours and which connectors they exit the fusebox.
For testing switch on ignition and disconnect the wires at the otter switch. One should be black wire so touch the other one against bare metal on the engine and the fans should come on (and make you jump). If good then touch the two wires to each other which should produce the same result. If not then that earth wire is dead. For some strange reason it terminates on a spare nut/stud on the back of the alternator. I have seen a car where someone had mistaken that connection for something else and had connected it to the charge terminal.
Steve
Some have just one relay some have two.
But in each case the earth path for the relay coil is the otter switch so is not an earth internal to the fusebox.
Come back and I can give you wire colours and which connectors they exit the fusebox.
For testing switch on ignition and disconnect the wires at the otter switch. One should be black wire so touch the other one against bare metal on the engine and the fans should come on (and make you jump). If good then touch the two wires to each other which should produce the same result. If not then that earth wire is dead. For some strange reason it terminates on a spare nut/stud on the back of the alternator. I have seen a car where someone had mistaken that connection for something else and had connected it to the charge terminal.
Steve
as already said above:its an early car with 1 relay switching both fans
when i said "i investigated the fault" that means that i have already made all possible tests.
finally i put a seperate earthing-wire from outside to the relay feet which is connected to earth --> everything is fine...conclusion: earth does not arrive to the relay. otter switch and the cable to the inside of the car is fne, too. earth wire on otter swirch (the black one) has a good connection to earth.
as you can see..i made already all the necessary tests.
at the beginning it was "enough" to wobble on the relais to bring the fans back into life...this possibility is meanwhile gone.
changing relays was also not solving the problem. (new relais, same as with the old relais)
so it must be an internal fault of the relais/fuse board.
when i said "i investigated the fault" that means that i have already made all possible tests.
finally i put a seperate earthing-wire from outside to the relay feet which is connected to earth --> everything is fine...conclusion: earth does not arrive to the relay. otter switch and the cable to the inside of the car is fne, too. earth wire on otter swirch (the black one) has a good connection to earth.
as you can see..i made already all the necessary tests.
at the beginning it was "enough" to wobble on the relais to bring the fans back into life...this possibility is meanwhile gone.
changing relays was also not solving the problem. (new relais, same as with the old relais)
so it must be an internal fault of the relais/fuse board.
Edited by LLantrisant on Saturday 16th March 21:11
Loubaruch said:
Have you removed the Fan relay?
If not you may find it has welded itself to the holder, not uncommon on single relay fans.
I would suggest removing it and cleaning the socket pins, Do not be surprised if it has stuck fast, I had to demolish my relay to remove the welded pin.
do people not read what im writing?If not you may find it has welded itself to the holder, not uncommon on single relay fans.
I would suggest removing it and cleaning the socket pins, Do not be surprised if it has stuck fast, I had to demolish my relay to remove the welded pin.
"at the beginning it was "enough" to wobble on the relais to bring the fans back into life...this possibility is meanwhile gone.
changing relays was also not solving the problem. (new relais, same as with the old relais)"
So if that is relay 7 (bottom left) then the relay (pin 85) connects through the fusebox and comes out at connector G (Red) and is marked 71 (pin position 8).
Likelihood is that the female terminal in the 'box is no longer gripping the relay pin. You may be able to get a thin screwdriver down the side and close the contacts a little or failing that bent the relay pin so when you look on the end of the pin it is slightly banana shaped.
Steve
Likelihood is that the female terminal in the 'box is no longer gripping the relay pin. You may be able to get a thin screwdriver down the side and close the contacts a little or failing that bent the relay pin so when you look on the end of the pin it is slightly banana shaped.
Steve
LLantrisant said:
do people not read what im writing?
I've read through what you have typed, you have tested from the otter switch to the fusebox and found everything in good order, then by bridging out the otter switch or earthing its negative switched cable at the fusebox you have proven that there is no switched negative reaching the relay even though the used fusebox terminals for that part of the circuit are goodYes you can split the fusebox by using a screwdriver, go easy on the clips, don't worry too much about breaking the odd clip as there are plenty of them and Araldite works wonders, once inside you will see all the nasty links and circuit board
@steve...good advice....have tried it.....problem solved.....
by the way: here a video of somebody dismanteling a similar fuse-box...looks quite complex but very sturdy inside....watching this i can not imagine that something internally can really break...even corrosionwise
https://www.youtube.com/watch?v=XhMwjpsvT5k&t=...
by the way: here a video of somebody dismanteling a similar fuse-box...looks quite complex but very sturdy inside....watching this i can not imagine that something internally can really break...even corrosionwise
https://www.youtube.com/watch?v=XhMwjpsvT5k&t=...
@steve: as already posted above, (check my posting directly below your advise), i could solve the problem.
on the video, this guy is mentioning a dodgy Pin /Blade connector, but its just a bit "black" (burned) in 1 area.
but nothing really inside those boxes which could really break or getting damaged, imo.
on the video, this guy is mentioning a dodgy Pin /Blade connector, but its just a bit "black" (burned) in 1 area.
but nothing really inside those boxes which could really break or getting damaged, imo.
Edited by LLantrisant on Tuesday 19th March 20:29
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